I've been following various sessions today at the PDC on Linq and the C# 3.0 language extensions that are the base foundation to make this work.
As the LINQ framework is really cool, I think that goes maybe even more for the language enhancements. By providing Lambda functions, Anonymous types, Object Initializers and Extension Functions, C# has gained an awful amount of extensibility and power.
Stay tuned for some more in depth post on what a the above stuff is and how it helps to realize the Language Integrated Query facilities..