Enterprise Library, while not an application, is considered best practice. The Pet Shop app was recently updated for .Net 2.0. You might want to poke around here http://msdn.microsoft.com/practices/. Also, this book http://www.amazon.com/gp/product/0321246756/sr=8-8/qid=1140624872/ref=pd_bbs_8/103-4786778-9535042?%5Fencoding=UTF8

>I was reading some reference material about IBuySpy. It made me wonder if Microsoft released any "best practices" kinds of sample real world applications with source code? Anybody know of any?