Added more basic GUI info.

Author: AaronW

docs/scenarios/gui.rst

@@ -4,20 +4,23 @@ GUI Applications
 
 Qt
 ::
+Qt is a cross-platform application framework that is widely used for developing software with a GUI but can also be used for non-GUI applications.
 
 PySide
 ------
+http://developer.qt.nokia.com/wiki/PySideDownloads/
 
 PyQt
 ----
-
+*Note: If your software does not fully comply with the GPL you will need a commercial license!*
+http://www.riverbankcomputing.co.uk/software/pyqt/download
 
 Cocoa
 :::::
 
 PyObjC
 ------
-
+*Note: Only available on Mac OSX. Don't pick this if you're writing a cross-platform application.*
 
 WXPython
 ::::::::