Since I'm busy on my current project with LINQ, I collect some interresting links for LINQ.
Some video material (for the moment 11 videos) about LINQ can be found on the asp.Net under the learn section.
The Microsoft LINQ discussion forum : http://forums.microsoft.com/msdn/showforum.aspx?forumid=123.
Through my friend Kris van der Mast, I also found out about a nice tool, called LINQPad. It's a great tool to learn LINQ without using (the heavy
) VS2008. They even have a LINQ quiz, so you could test your knowledge
.

This is it for the moment. I will keep you up to date if I have some other interesting links about LINQ.