Scott Guthrie takes a quick peek at Visual NDepend and mentions Practical .NET2 and C#2. Here is the link (and i've also copy/pasted the article below).
Patrick pointed me at the cool (and free!) NDepend code analyzer that he has built for .NET 2.0. It analyzes .NET assemblies and generates reports on design quality metrics, along with warnings and diagrams. Some of the graphical reports in particular are very cool:
You can learn more about it and download it for free here.
Patrick has also written an awesome book on C# 2.0 that has received great reviews on both Amazon and blogs. You can learn more about and download all of the code-samples for free here, and buy it on Amazon here.