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Buy this book (if you haven't won it yet). It's basically covering several of the same patterns in the Gang of Four's (GoF) Design Patterns book, but replaces the SmallTalk and C examples with java (same syntax as C#), and it's a lot more fun to read (is that blasphemy?).

"This book is an absolute must-read for all .NET developers. It gives clear do and don't guidance on how to design class libraries for .NET." --Jeffrey Richter, author, trainer and .net genius