Consider this another vote for Richter's "CLR Via C#" http://www.amazon.com/CLR-via-Dev-Pro-Jeffrey-Richter/dp/0735627045/ref=sr_1_1?ie=UTF8&s=books&qid=1281111

Consider this another vote for Richter's "CLR Via C#" http://www.amazon.com/CLR-via-Dev-Pro-Jeffrey-Richter/dp/0735627045/ref=sr_1_1?ie=UTF8&s=books&qid=1281111125&sr=8-1 http://www.amazon.com/CLR-via-Dev-Pro-Jeffrey-Richter/dp/073... Get the latest edition, covering .NET 4. The chapters on concurrency and I/O alone are worth the price of admission.