Building a Composite WPF Application
Jeff Brand (Microsoft Evangelist from Minneapolis) has put together the start of an excellent screen cast on throwing up composite applications using the Microsoft Composite Application Library and WPF.
It's worth the 20 minutes or so to watch it -
http://slickthought.net/post/2008/10/Building-a-WPF-Composite-Application-Series-Part-1.aspx