If you are in the Birmingham, AL area on July 25-26, consider signing up for the free two day LINQ Bootcamp event. I'm hoping to be there to help answer your questions as well. If you're interested in more information, here's a copy of the original announcement:
…The upcoming LINQ Bootcamp [will be] on July 25th and 26th. To register for this great event please go to http://www.clicktoattend.com/?id=139378 . Seating is limited to this free event. We still need volunteers for presenting, currently more than half the chapters are still available. Your participation is needed to make this event a success so be ready to pick out a chapter when you arrive, first come first serve. You can also e-mail us at BhamSoftwareDevAssoc@live.com to volunteer or get more info.
Update: as of 7/6/09 Chapters 3, 9, 10, 11, and 12 have been volunteered for, other chapters are still open to potential presenters. All presenters will get a free copy of the book.
Unfortunately, the book in question isn't "LINQ in Action", but it should be a good event regardless.