Before I forget, 101 C# Code Samples were recently added to MSDN  (thanks Duncan) , here are just some appetizers of the samples available:

• Asynchronous/multithreaded programming
• Socket Programming
• Garbage Collection basics
• Automating Internet Explorer in your applications
• Encrypting and Decrypting data
• Thread Pooling
• Using Windows XP Themes

Sean and Scott did the original 101 VB code samples, and I believe they also worked on porting these to C#.