I just found this 500 pages word document, containing the full C# Language Specs for 1.0, 2.0 and the new 3.0 C# version.
Even the doc is quite long (of course I haven’t went into it entirely YET), it must be the best and the most authoritative reference for the C# language, because it was written by its own creators !
The document is well organized, includes syntax definitions, examples, and instructions for using all the language features, including latest additions for the new release, such as Linq and Lambda expressions. C# 3.0 is included in latest .NET 3.5 release.
I hope you find it useful, I think it has huge value and will help you with any doubt regarding the C# features set, and exploiting all its potential as well.