diff --git a/openlp/core/ui/filerenameform.py b/openlp/core/ui/filerenameform.py
index d13cf5519..0743578a1 100644
--- a/openlp/core/ui/filerenameform.py
+++ b/openlp/core/ui/filerenameform.py
@@ -26,6 +26,9 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
+"""
+The file rename dialog.
+"""
 
 from PyQt4 import QtGui
 
@@ -33,11 +36,15 @@ from filerenamedialog import Ui_FileRenameDialog
 
 from openlp.core.lib import translate
 
+
 class FileRenameForm(QtGui.QDialog, Ui_FileRenameDialog):
     """
-    The exception dialog
+    The file rename dialog
     """
     def __init__(self, parent):
+        """
+        Constructor
+        """
         QtGui.QDialog.__init__(self, parent)
         self.setupUi(self)
 
diff --git a/openlp/core/ui/firsttimeform.py b/openlp/core/ui/firsttimeform.py
index 95ae35d5d..1829780d1 100644
--- a/openlp/core/ui/firsttimeform.py
+++ b/openlp/core/ui/firsttimeform.py
@@ -26,7 +26,9 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
-
+"""
+This module contains the first time wizard.
+"""
 import io
 import logging
 import os
@@ -45,14 +47,15 @@ from firsttimewizard import Ui_FirstTimeWizard, FirstTimePage
 
 log = logging.getLogger(__name__)
 
+
 class ThemeScreenshotThread(QtCore.QThread):
     """
     This thread downloads the theme screenshots.
     """
-    def __init__(self, parent):
-        QtCore.QThread.__init__(self, parent)
-
     def run(self):
+        """
+        Overridden method to run the thread.
+        """
         themes = self.parent().config.get(u'themes', u'files')
         themes = themes.split(u',')
         config = self.parent().config
@@ -79,7 +82,10 @@ class FirstTimeForm(QtGui.QWizard, Ui_FirstTimeWizard):
     log.info(u'ThemeWizardForm loaded')
 
     def __init__(self, screens, parent=None):
-        QtGui.QWizard.__init__(self, parent)
+        """
+        Create and set up the first time wizard.
+        """
+        super(FirstTimeForm, self).__init__(parent)
         self.setupUi(self)
         self.screens = screens
         # check to see if we have web access
@@ -297,11 +303,20 @@ class FirstTimeForm(QtGui.QWizard, Ui_FirstTimeWizard):
                 screenshot)))
 
     def _getFileSize(self, url):
+        """
+        Get the size of a file.
+
+        ``url``
+            The URL of the file we want to download.
+        """
         site = urllib.urlopen(url)
         meta = site.info()
         return int(meta.getheaders("Content-Length")[0])
 
     def _downloadProgress(self, count, block_size):
+        """
+        Calculate and display the download progress.
+        """
         increment = (count * block_size) - self.previous_size
         self._incrementProgressBar(None, increment)
         self.previous_size = count * block_size
@@ -459,5 +474,8 @@ class FirstTimeForm(QtGui.QWizard, Ui_FirstTimeWizard):
             Settings().setValue(u'themes/global theme', self.themeComboBox.currentText())
 
     def _setPluginStatus(self, field, tag):
+        """
+        Set the status of a plugin.
+        """
         status = PluginStatus.Active if field.checkState() == QtCore.Qt.Checked else PluginStatus.Inactive
         Settings().setValue(tag, status)
diff --git a/openlp/core/ui/firsttimelanguagedialog.py b/openlp/core/ui/firsttimelanguagedialog.py
index eae9dc198..21f4dabcd 100644
--- a/openlp/core/ui/firsttimelanguagedialog.py
+++ b/openlp/core/ui/firsttimelanguagedialog.py
@@ -26,14 +26,23 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
-
+"""
+The UI widgets of the language selection dialog.
+"""
 from PyQt4 import QtGui
 
 from openlp.core.lib import translate
 from openlp.core.lib.ui import create_button_box
 
+
 class Ui_FirstTimeLanguageDialog(object):
+    """
+    The UI widgets of the language selection dialog.
+    """
     def setupUi(self, languageDialog):
+        """
+        Set up the UI.
+        """
         languageDialog.setObjectName(u'languageDialog')
         languageDialog.resize(300, 50)
         self.dialogLayout = QtGui.QVBoxLayout(languageDialog)
@@ -59,6 +68,9 @@ class Ui_FirstTimeLanguageDialog(object):
         self.setMaximumHeight(self.sizeHint().height())
 
     def retranslateUi(self, languageDialog):
+        """
+        Translate the UI on the fly.
+        """
         self.setWindowTitle(translate('OpenLP.FirstTimeLanguageForm', 'Select Translation'))
         self.infoLabel.setText(
             translate('OpenLP.FirstTimeLanguageForm', 'Choose the translation you\'d like to use in OpenLP.'))
diff --git a/openlp/core/ui/firsttimelanguageform.py b/openlp/core/ui/firsttimelanguageform.py
index c3bf4a07c..8689117d0 100644
--- a/openlp/core/ui/firsttimelanguageform.py
+++ b/openlp/core/ui/firsttimelanguageform.py
@@ -26,18 +26,24 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
-
+"""
+The language selection dialog.
+"""
 from PyQt4 import QtGui
 
 from openlp.core.lib.ui import create_action
 from openlp.core.utils import LanguageManager
 from firsttimelanguagedialog import Ui_FirstTimeLanguageDialog
 
+
 class FirstTimeLanguageForm(QtGui.QDialog, Ui_FirstTimeLanguageDialog):
     """
-    The exception dialog
+    The language selection dialog.
     """
     def __init__(self, parent=None):
+        """
+        Constructor
+        """
         QtGui.QDialog.__init__(self, parent)
         self.setupUi(self)
         self.qmList = LanguageManager.get_qm_list()
@@ -52,6 +58,9 @@ class FirstTimeLanguageForm(QtGui.QDialog, Ui_FirstTimeLanguageDialog):
         return QtGui.QDialog.exec_(self)
 
     def accept(self):
+        """
+        Run when the dialog is OKed.
+        """
         # It's the first row so must be Automatic
         if self.languageComboBox.currentIndex() == 0:
             LanguageManager.auto_language = True
@@ -63,6 +72,9 @@ class FirstTimeLanguageForm(QtGui.QDialog, Ui_FirstTimeLanguageDialog):
         return QtGui.QDialog.accept(self)
 
     def reject(self):
+        """
+        Run when the dialog is canceled.
+        """
         LanguageManager.auto_language = True
         LanguageManager.set_language(False, False)
         return QtGui.QDialog.reject(self)
diff --git a/openlp/core/ui/firsttimewizard.py b/openlp/core/ui/firsttimewizard.py
index 2c1e9e0da..1602b5254 100644
--- a/openlp/core/ui/firsttimewizard.py
+++ b/openlp/core/ui/firsttimewizard.py
@@ -26,7 +26,9 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
-
+"""
+The UI widgets for the first time wizard.
+"""
 from PyQt4 import QtCore, QtGui
 
 import sys
@@ -34,7 +36,11 @@ import sys
 from openlp.core.lib import translate
 from openlp.core.lib.ui import add_welcome_page
 
+
 class FirstTimePage(object):
+    """
+    An enumeration class with each of the pages of the wizard.
+    """
     Welcome = 0
     Plugins = 1
     NoInternet = 2
@@ -46,13 +52,19 @@ class FirstTimePage(object):
 
 
 class Ui_FirstTimeWizard(object):
+    """
+    The UI widgets for the first time wizard.
+    """
     def setupUi(self, FirstTimeWizard):
+        """
+        Set up the UI.
+        """
         FirstTimeWizard.setObjectName(u'FirstTimeWizard')
         FirstTimeWizard.resize(550, 386)
         FirstTimeWizard.setModal(True)
         FirstTimeWizard.setWizardStyle(QtGui.QWizard.ModernStyle)
         FirstTimeWizard.setOptions(QtGui.QWizard.IndependentPages | QtGui.QWizard.NoBackButtonOnStartPage |
-            QtGui.QWizard.NoBackButtonOnLastPage |QtGui.QWizard.HaveCustomButton1)
+            QtGui.QWizard.NoBackButtonOnLastPage | QtGui.QWizard.HaveCustomButton1)
         self.finishButton = self.button(QtGui.QWizard.FinishButton)
         self.noInternetFinishButton = self.button(QtGui.QWizard.CustomButton1)
         self.cancelButton = self.button(QtGui.QWizard.CancelButton)
@@ -193,17 +205,20 @@ class Ui_FirstTimeWizard(object):
         self.retranslateUi(FirstTimeWizard)
 
     def retranslateUi(self, FirstTimeWizard):
+        """
+        Translate the UI on the fly
+        """
         FirstTimeWizard.setWindowTitle(translate(
             'OpenLP.FirstTimeWizard', 'First Time Wizard'))
-        self.titleLabel.setText(u'<span style="font-size:14pt; font-weight:600;">%s</span>' % \
+        self.titleLabel.setText(u'<span style="font-size:14pt; font-weight:600;">%s</span>' %
             translate('OpenLP.FirstTimeWizard', 'Welcome to the First Time Wizard'))
         self.informationLabel.setText(translate('OpenLP.FirstTimeWizard',
             'This wizard will help you to configure OpenLP for initial use.'
             ' Click the next button below to start.'))
         self.pluginPage.setTitle(translate('OpenLP.FirstTimeWizard', 'Activate required Plugins'))
-        self.pluginPage.setSubTitle(translate('OpenLP.FirstTimeWizard','Select the Plugins you wish to use. '))
+        self.pluginPage.setSubTitle(translate('OpenLP.FirstTimeWizard', 'Select the Plugins you wish to use. '))
         self.songsCheckBox.setText(translate('OpenLP.FirstTimeWizard', 'Songs'))
-        self.customCheckBox.setText(translate('OpenLP.FirstTimeWizard','Custom Slides'))
+        self.customCheckBox.setText(translate('OpenLP.FirstTimeWizard', 'Custom Slides'))
         self.bibleCheckBox.setText(translate('OpenLP.FirstTimeWizard', 'Bible'))
         self.imageCheckBox.setText(translate('OpenLP.FirstTimeWizard', 'Images'))
         # TODO Presentation plugin is not yet working on Mac OS X.
diff --git a/openlp/core/ui/formattingtagdialog.py b/openlp/core/ui/formattingtagdialog.py
index c9cdb15df..fbf5707ed 100644
--- a/openlp/core/ui/formattingtagdialog.py
+++ b/openlp/core/ui/formattingtagdialog.py
@@ -26,7 +26,9 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
-
+"""
+The UI widgets for the formatting tags window.
+"""
 from PyQt4 import QtCore, QtGui
 
 from openlp.core.lib import translate, UiStrings
@@ -34,8 +36,13 @@ from openlp.core.lib.ui import create_button_box
 
 
 class Ui_FormattingTagDialog(object):
-
+    """
+    The UI widgets for the formatting tags window.
+    """
     def setupUi(self, formattingTagDialog):
+        """
+        Set up the UI
+        """
         formattingTagDialog.setObjectName(u'formattingTagDialog')
         formattingTagDialog.resize(725, 548)
         self.listdataGridLayout = QtGui.QGridLayout(formattingTagDialog)
@@ -116,6 +123,9 @@ class Ui_FormattingTagDialog(object):
         self.retranslateUi(formattingTagDialog)
 
     def retranslateUi(self, formattingTagDialog):
+        """
+        Translate the UI on the fly
+        """
         formattingTagDialog.setWindowTitle(translate('OpenLP.FormattingTagDialog', 'Configure Formatting Tags'))
         self.editGroupBox.setTitle(translate('OpenLP.FormattingTagDialog', 'Edit Selection'))
         self.savePushButton.setText(translate('OpenLP.FormattingTagDialog', 'Save'))
diff --git a/openlp/core/ui/formattingtagform.py b/openlp/core/ui/formattingtagform.py
index 2e72bdd65..1085afbcd 100644
--- a/openlp/core/ui/formattingtagform.py
+++ b/openlp/core/ui/formattingtagform.py
@@ -27,10 +27,9 @@
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
 """
-The :mod:`formattingtagform` provides an Tag Edit facility. The Base set are
-protected and included each time loaded. Custom tags can be defined and saved.
-The Custom Tag arrays are saved in a pickle so QSettings works on them. Base
-Tags cannot be changed.
+The :mod:`formattingtagform` provides an Tag Edit facility. The Base set are protected and included each time loaded.
+Custom tags can be defined and saved. The Custom Tag arrays are saved in a pickle so QSettings works on them. Base Tags
+cannot be changed.
 """
 from PyQt4 import QtCore, QtGui
 
@@ -49,7 +48,7 @@ class FormattingTagForm(QtGui.QDialog, Ui_FormattingTagDialog):
         """
         QtGui.QDialog.__init__(self, parent)
         self.setupUi(self)
-        QtCore.QObject.connect(self.tagTableWidget, QtCore.SIGNAL(u'itemSelectionChanged()'),self.onRowSelected)
+        QtCore.QObject.connect(self.tagTableWidget, QtCore.SIGNAL(u'itemSelectionChanged()'), self.onRowSelected)
         QtCore.QObject.connect(self.newPushButton, QtCore.SIGNAL(u'clicked()'), self.onNewClicked)
         QtCore.QObject.connect(self.savePushButton, QtCore.SIGNAL(u'clicked()'), self.onSavedClicked)
         QtCore.QObject.connect(self.deletePushButton, QtCore.SIGNAL(u'clicked()'), self.onDeleteClicked)
diff --git a/openlp/core/ui/generaltab.py b/openlp/core/ui/generaltab.py
index 31a07037a..4626d36d2 100644
--- a/openlp/core/ui/generaltab.py
+++ b/openlp/core/ui/generaltab.py
@@ -26,6 +26,9 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
+"""
+The general tab of the configuration dialog.
+"""
 import logging
 
 from PyQt4 import QtCore, QtGui
@@ -34,6 +37,7 @@ from openlp.core.lib import Receiver, Settings, SettingsTab, translate, ScreenLi
 
 log = logging.getLogger(__name__)
 
+
 class GeneralTab(SettingsTab):
     """
     GeneralTab is the general settings tab in the settings dialog.
diff --git a/openlp/core/ui/maindisplay.py b/openlp/core/ui/maindisplay.py
index 3fed96ec4..400d82f5b 100644
--- a/openlp/core/ui/maindisplay.py
+++ b/openlp/core/ui/maindisplay.py
@@ -27,12 +27,16 @@
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
 """
-The :mod:`maindisplay` module provides the functionality to display screens
-and play multimedia within OpenLP.
+The :mod:`maindisplay` module provides the functionality to display screens and play multimedia within OpenLP.
+
+Some of the code for this form is based on the examples at:
+
+* `http://www.steveheffernan.com/html5-video-player/demo-video-player.html`_
+* `http://html5demos.com/two-videos`_
+
 """
 import cgi
 import logging
-import os
 import sys
 
 from PyQt4 import QtCore, QtGui, QtWebKit, QtOpenGL
@@ -47,8 +51,6 @@ from openlp.core.ui import HideMode, AlertLocation
 
 log = logging.getLogger(__name__)
 
-#http://www.steveheffernan.com/html5-video-player/demo-video-player.html
-#http://html5demos.com/two-videos
 
 class Display(QtGui.QGraphicsView):
     """
@@ -57,6 +59,9 @@ class Display(QtGui.QGraphicsView):
     Preview display.
     """
     def __init__(self, parent, live, controller):
+        """
+        Constructor
+        """
         if live:
             QtGui.QGraphicsView.__init__(self)
             # Overwrite the parent() method.
@@ -101,6 +106,9 @@ class Display(QtGui.QGraphicsView):
             QtCore.Qt.ScrollBarAlwaysOff)
 
     def resizeEvent(self, event):
+        """
+        React to resizing of this display
+        """
         self.webView.setGeometry(0, 0, self.width(), self.height())
 
     def isWebLoaded(self):
@@ -116,6 +124,9 @@ class MainDisplay(Display):
     This is the display screen as a specialized class from the Display class
     """
     def __init__(self, parent, live, controller):
+        """
+        Constructor
+        """
         Display.__init__(self, parent, live, controller)
         self.screens = ScreenList()
         self.rebuildCSS = False
@@ -153,6 +164,9 @@ class MainDisplay(Display):
             QtCore.QObject.connect(Receiver.get_receiver(), QtCore.SIGNAL(u'config_updated'), self.configChanged)
 
     def setTransparency(self, enabled):
+        """
+        Set the transparency of the window
+        """
         if enabled:
             self.setAutoFillBackground(False)
         else:
@@ -386,7 +400,9 @@ class MainDisplay(Display):
             BackgroundType.to_string(BackgroundType.Transparent))
         if self.serviceItem.themedata.background_filename:
             self.serviceItem.bg_image_bytes = self.image_manager.getImageBytes(
-                self.serviceItem.themedata.background_filename,ImageSource.Theme)
+                self.serviceItem.themedata.background_filename,
+                ImageSource.Theme
+            )
         if image_path:
             image_bytes = self.image_manager.getImageBytes(image_path, ImageSource.ImagePlugin)
         else:
@@ -532,6 +548,9 @@ class AudioPlayer(QtCore.QObject):
             self.mediaObject.enqueue(self.playlist[self.currentIndex])
 
     def onFinished(self):
+        """
+        When the audio track finishes.
+        """
         if self.repeat:
             log.debug(u'Repeat is enabled... here we go again!')
             self.mediaObject.clearQueue()
@@ -540,6 +559,9 @@ class AudioPlayer(QtCore.QObject):
             self.play()
 
     def connectVolumeSlider(self, slider):
+        """
+        Connect the volume slider to the output channel.
+        """
         slider.setAudioOutput(self.audioObject)
 
     def reset(self):
@@ -586,6 +608,9 @@ class AudioPlayer(QtCore.QObject):
         self.playlist.extend(map(Phonon.MediaSource, filenames))
 
     def next(self):
+        """
+        Skip forward to the next track in the list
+        """
         if not self.repeat and self.currentIndex + 1 >= len(self.playlist):
             return
         isPlaying = self.mediaObject.state() == Phonon.PlayingState
@@ -599,6 +624,9 @@ class AudioPlayer(QtCore.QObject):
             self.mediaObject.play()
 
     def goTo(self, index):
+        """
+        Go to a particular track in the list
+        """
         isPlaying = self.mediaObject.state() == Phonon.PlayingState
         self.mediaObject.clearQueue()
         self.mediaObject.clear()
@@ -609,5 +637,7 @@ class AudioPlayer(QtCore.QObject):
 
     #@todo is this used?
     def connectSlot(self, signal, slot):
+        """
+        Connect a slot to a signal on the media object
+        """
         QtCore.QObject.connect(self.mediaObject, signal, slot)
-
diff --git a/openlp/core/ui/mainwindow.py b/openlp/core/ui/mainwindow.py
index 77e954943..32058cce9 100644
--- a/openlp/core/ui/mainwindow.py
+++ b/openlp/core/ui/mainwindow.py
@@ -26,7 +26,9 @@
 # with this program; if not, write to the Free Software Foundation, Inc., 59  #
 # Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
 ###############################################################################
-
+"""
+This is the main window, where all the action happens.
+"""
 import logging
 import os
 import sys
@@ -80,6 +82,9 @@ PROGRESSBAR_STYLE = """
 
 
 class Ui_MainWindow(object):
+    """
+    This is the UI part of the main window.
+    """
     def setupUi(self, mainWindow):
         """
         Set up the user interface
@@ -148,7 +153,7 @@ class Ui_MainWindow(object):
         self.defaultThemeLabel.setObjectName(u'defaultThemeLabel')
         self.statusBar.addPermanentWidget(self.defaultThemeLabel)
         # Create the MediaManager
-        self.mediaManagerDock = OpenLPDockWidget(mainWindow,u'mediaManagerDock', u':/system/system_mediamanager.png')
+        self.mediaManagerDock = OpenLPDockWidget(mainWindow, u'mediaManagerDock', u':/system/system_mediamanager.png')
         self.mediaManagerDock.setStyleSheet(MEDIA_MANAGER_STYLE)
         # Create the media toolbox
         self.mediaToolBox = QtGui.QToolBox(self.mediaManagerDock)
@@ -406,7 +411,8 @@ class Ui_MainWindow(object):
             'Toggle the visibility of the service manager.'))
         self.viewPreviewPanel.setText(translate('OpenLP.MainWindow', '&Preview Panel'))
         self.viewPreviewPanel.setToolTip(translate('OpenLP.MainWindow', 'Toggle Preview Panel'))
-        self.viewPreviewPanel.setStatusTip(translate('OpenLP.MainWindow', 'Toggle the visibility of the preview panel.'))
+        self.viewPreviewPanel.setStatusTip(
+            translate('OpenLP.MainWindow', 'Toggle the visibility of the preview panel.'))
         self.viewLivePanel.setText(translate('OpenLP.MainWindow', '&Live Panel'))
         self.viewLivePanel.setToolTip(translate('OpenLP.MainWindow', 'Toggle Live Panel'))
         self.lockPanel.setText(translate('OpenLP.MainWindow', 'L&ock Panels'))
@@ -517,7 +523,7 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
             self.onSettingsShortcutsItemClicked)
         QtCore.QObject.connect(self.settingsImportItem, QtCore.SIGNAL(u'triggered()'),
             self.onSettingsImportItemClicked)
-        QtCore.QObject.connect(self.settingsExportItem,QtCore.SIGNAL(u'triggered()'), self.onSettingsExportItemClicked)
+        QtCore.QObject.connect(self.settingsExportItem, QtCore.SIGNAL(u'triggered()'), self.onSettingsExportItemClicked)
         # i18n set signals for languages
         self.languageGroup.triggered.connect(LanguageManager.set_language)
         QtCore.QObject.connect(self.modeDefaultItem, QtCore.SIGNAL(u'triggered()'), self.onModeDefaultItemClicked)
@@ -527,7 +533,8 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
         QtCore.QObject.connect(Receiver.get_receiver(), QtCore.SIGNAL(u'openlp_version_check'), self.versionNotice)
         QtCore.QObject.connect(Receiver.get_receiver(), QtCore.SIGNAL(u'live_display_blank_check'), self.blankCheck)
         QtCore.QObject.connect(Receiver.get_receiver(), QtCore.SIGNAL(u'config_screen_changed'), self.screenChanged)
-        QtCore.QObject.connect(Receiver.get_receiver(), QtCore.SIGNAL(u'mainwindow_status_text'), self.showStatusMessage)
+        QtCore.QObject.connect(Receiver.get_receiver(), QtCore.SIGNAL(u'mainwindow_status_text'),
+            self.showStatusMessage)
         QtCore.QObject.connect(Receiver.get_receiver(), QtCore.SIGNAL(u'cleanup'), self.clean_up)
         # Media Manager
         QtCore.QObject.connect(self.mediaToolBox, QtCore.SIGNAL(u'currentChanged(int)'), self.onMediaToolBoxChanged)
@@ -583,11 +590,17 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
         Receiver.send_message(u'cursor_normal')
 
     def setAutoLanguage(self, value):
+        """
+        Set the language to automatic.
+        """
         self.languageGroup.setDisabled(value)
         LanguageManager.auto_language = value
         LanguageManager.set_language(self.languageGroup.checkedAction())
 
     def onMediaToolBoxChanged(self, index):
+        """
+        Focus a widget when the media toolbox changes.
+        """
         widget = self.mediaToolBox.widget(index)
         if widget:
             widget.onFocus()
@@ -642,7 +655,9 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
                 Receiver.send_message(u'openlp_process_events')
 
     def firstTime(self):
-        # Import themes if first time
+        """
+        Import themes if first time
+        """
         Receiver.send_message(u'openlp_process_events')
         for plugin in self.pluginManager.plugins:
             if hasattr(plugin, u'firstTime'):
@@ -705,14 +720,23 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
                     translate('OpenLP.MainWindow', 'The Main Display has been blanked out'))
 
     def onErrorMessage(self, data):
+        """
+        Display an error message
+        """
         Receiver.send_message(u'close_splash')
         QtGui.QMessageBox.critical(self, data[u'title'], data[u'message'])
 
     def onWarningMessage(self, data):
+        """
+        Display a warning message
+        """
         Receiver.send_message(u'close_splash')
         QtGui.QMessageBox.warning(self, data[u'title'], data[u'message'])
 
     def onInformationMessage(self, data):
+        """
+        Display an informational message
+        """
         Receiver.send_message(u'close_splash')
         QtGui.QMessageBox.information(self, data[u'title'], data[u'message'])
 
@@ -800,8 +824,8 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
                 QtGui.QMessageBox.No)
         if answer == QtGui.QMessageBox.No:
             return
-        import_file_name = QtGui.QFileDialog.getOpenFileName(self,translate('OpenLP.MainWindow', 'Open File'), '',
-                translate('OpenLP.MainWindow', 'OpenLP Export Settings Files (*.conf)'))
+        import_file_name = QtGui.QFileDialog.getOpenFileName(self, translate('OpenLP.MainWindow', 'Open File'), '',
+            translate('OpenLP.MainWindow', 'OpenLP Export Settings Files (*.conf)'))
         if not import_file_name:
             return
         setting_sections = []
@@ -1100,18 +1124,33 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
         self.setWindowTitle(title)
 
     def showStatusMessage(self, message):
+        """
+        Show a message in the status bar
+        """
         self.statusBar.showMessage(message)
 
     def defaultThemeChanged(self, theme):
+        """
+        Update the default theme indicator in the status bar
+        """
         self.defaultThemeLabel.setText(translate('OpenLP.MainWindow', 'Default Theme: %s') % theme)
 
     def toggleMediaManager(self):
+        """
+        Toggle the visibility of the media manager
+        """
         self.mediaManagerDock.setVisible(not self.mediaManagerDock.isVisible())
 
     def toggleServiceManager(self):
+        """
+        Toggle the visibility of the service manager
+        """
         self.serviceManagerDock.setVisible(not self.serviceManagerDock.isVisible())
 
     def toggleThemeManager(self):
+        """
+        Toggle the visibility of the theme manager
+        """
         self.themeManagerDock.setVisible(not self.themeManagerDock.isVisible())
 
     def setPreviewPanelVisibility(self, visible):
@@ -1295,13 +1334,22 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
             Receiver.send_message(u'openlp_process_events')
 
     def setNewDataPath(self, new_data_path):
+        """
+        Set the new data path
+        """
         self.newDataPath = new_data_path
 
     def setCopyData(self, copy_data):
+        """
+        Set the flag to copy the data
+        """
         self.copyData = copy_data
 
     def changeDataDirectory(self):
-        log.info(u'Changing data path to %s' % self.newDataPath )
+        """
+        Change the data directory.
+        """
+        log.info(u'Changing data path to %s' % self.newDataPath)
         old_data_path = unicode(AppLocation.get_data_path())
         # Copy OpenLP data to new location if requested.
         if self.copyData:
@@ -1330,4 +1378,3 @@ class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
         # Check if the new data path is our default.
         if self.newDataPath == AppLocation.get_directory(AppLocation.DataDir):
             settings.remove(u'advanced/data path')
-