I was collecting some learning material on C# 4.0 and stumbled across some useful videos, articles and documents available on C# 4.0. I am just listing a few of them. Check them out!
Samples and Documents
New features of C# 4.0 (Beta 2)
Update: Also check out Visual Studio 2010 and .NET Framework 4 Training Kit – Updated (February Edition)
Please note that C# 4.0 is in Beta as of this writing.