Practical .NET2 and C#2 by Patrick Smacchia
Even though this book was released over a year ago, and the .NET framework 3.0 has been released since then (but it’s really just the .NET framework 2.0 with the WPF + WCF additions), it is still relevant and one of the best in this subject area.
Several of the Amazon reviews comment on the fact that the English in the book is a little hard to follow in one or two places. Frankly, I am amazed this got past an editor. This aside, it’s a great book. It covers just about everything you need to know about the new features and how to put them to practical use.
There is a Code Project article listing the new features in .NET 2.0, also written by Patrick, that is well worth checking out. Patrick Smacchia is the developer behind NDepend2, probably the most amazing tool to hit the Microsoft landscape since the release of the .NET framework.