Good opensource WPF applications

I have experience with Silverlight + MVVM + WCF RIA. My next project will be developing by WPF and its architecture is 3-tiers. I want to know are there go开发者_如何学Cod example for this kind of project?

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The MVVM is pretty cool and here is a MVVM lite which make your developement more easier. http://www.galasoft.ch/mvvm/#intro

Also, I recommend to check the project "Ribbon for WPF" which uses binding a lot. You can download from "http://www.microsoft.com/downloads/en/details.aspx?FamilyID=2bfc3187-74aa-4154-a670-76ef8bc2a0b4" which comes with the source code and samples.