Hooked On LINQ

Hooked On LINQ is a Wiki-based site, which provides a whole host of information about the new Extension of the .NET Framework from Microsoft. A really neat section is the 5 minute Overviews, which give quick yet concise introductions to the three flavors of LINQ: Plain LINQ (Objects); DLINQ (Database); and XLINQ (XML).
Also featured, are more resource links and Books on LINQ.