I would put "CLR via C#" at the top of that list. An absolutely necessary read for anyone using .NET

http://www.amazon.com/CLR-via-C-Jeffrey-Richter/dp/073562704...

Consider this another vote for Richter's "CLR Via C#" 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.