There's a lot of good material available about LINQ:
The main LINQ Project site (http://msdn2.microsoft.com/enus/netframework/aa904594.aspx) includes a Forums section where thousands of developers discuss LINQ, ask for support, and report bugs.
From my site (www.ferracchiati.com) you can find a lot of useful links for LINQ stuff.
At http://shop.ecompanystore.com/mseventdvd/MSD_Shop.asp you can order the DVD that contains full sessions from PDC 2005, where LINQ was unveiled.
On the Channel 9 site (http://channel9.msdn.com), Anders Hejlsberg and his team are often interviewed about LINQ issues and development.
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