Visual Studio like editor
http://editorsamples.codeplex.com/
Visual Studio like dock panel
http://avalondock.codeplex.com/
Adobe Illustrator to XAML Export
http://www.mikeswanson.com/XAMLExport/
Application Settings
http://msdn.microsoft.com/en-us/library/a65txexh.aspx
WPF Security
http://msdn.microsoft.com/en-us/library/aa970906.aspx
http://www.codeproject.com/KB/WPF/AnnotatingAnImageInWPF.aspx
An open source diff tool
http://www.codeproject.com/KB/applications/difftool.aspx
http://www.codeproject.com/KB/system/Map_Network_folder_UNC_.aspx
Document
http://www.catch22.net/tuts/neatpad/5
Preview document
http://www.codeproject.com/KB/WPF/wpf_vista_preview_handler.aspx?display=PrintAll
ToolTip
http://www.hardcodet.net/2009/04/wpf-tooltips-through-markup-extension
Drag Drop
http://www.codeproject.com/KB/WPF/XBAPDragDrop.aspx
TreeView
http://www.switchonthecode.com/tutorials/wpf-tutorial-dynamic-data-and-the-treeview
http://shevaspace.wordpress.com/2007/11/25/how-to-search-text-in-wpf-flowdocument/
Saving user settings in a partial trust XBAP
http://msblogs/ashafey/Lists/Posts/Post.aspx?ID=7
http://www.kreuzhofer.de/wordpress/2008/06/24/xbap-wcf-and-debugging-with-visual-studio-2008/