CodePlex is a new cool online software development environment built with the Visual Studio Team Foundation Server in the backend, yet it is still in Beta phase. Microsoft likes Betas (*g*), perhaps even more than CTPs. Actually you can find several useful applications on CodePlex, for example the Office 2007 Package Explorer (demonstrates the usage of the Packaging API) or cool controls (take a look at Ascend.NET)...
Good books are rare. One of them is surly O'Reillys Head First Design Patterns. Although the samples are written in Java it should not be a problem to translate them into C#. You can find a zip file with all the samples on http://www.msquaredweb.com/DesignPatterns/.
The book is also available in German language, with funny translations. For those of you who speak german: Would you translate StarBucks Cafe into "Sternback Kaffee" ?