I just took a look at
Ian Griffiths'
WPF MSDN sample. It's a simple application showing MSDN content pulled from the
MTPS Content Service, a web service giving you access to MSDN information. The UI is done with WPF. The web service client is done with WCF.
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Do you know what I like most about this sample? It's 44k! Finally, the OS is starting to offer a really serious built-in framework. Ok, ok, you still need to download .NET 3.0 on XP to make this work, but now a developer can concentrate on the real application logics, and still take advantage of a rich UI and connectivity.
If only WinFS was part of the party...