Silveright Business App Samples. Need some good references

I am working on a SL4 RIA Business application an开发者_开发百科d would like to get all the reference code out on the web I can find.. from a book is fine too.. Anyone know a few good ones? I will search the web but wanted to ask here as well incase I miss anything.

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This is one of reference apps/samples -

http://riaservices.codeplex.com/