Good comment w / skin WinAmp ...
I'm not sure if you came across this resource, but MSFT has compiled a fairly complete set of UX instructions here .
This includes a downloadable PDF file if you are reading this leisure activity. Although most of the recommendations apply to LOB (Line of Business) applications, you will find good information there on what not to do with WPF (that is, just because you can not mean what you should ).
As for the full-blown GUIs of storefronts, this is a little light - these are mostly context-sensitive screen screens. However, I found some good examples of user interfaces from the template libraries that Yahoo offers , and Infragistics has a neat site called Quince that has the same information, but with a Silverlight presentation.
NTN.
micahtan
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