I just picked up Mastering Mountain Bike Skills, by Brian Lopes. This one offers LOTS of photos and very informative diagrams showing ideal cornering angles and whatnot. This book seems to offer detailed information on many topics that are only covered briefly in other books.
I second the review for the Ned Overend DVD. There are also these video freebies on the web:
http://www.dirtcamp.com/video_tips.shtml
And this site (text/images only, but fairly comprehensive):
http://www.webmountainbike.com/basics.html
One to avoid: Despite many warnings, I purchased the DVD "Mountain Bike Fundamentals" while roaming around in REI. (You know how it is...It was one of those winter impulse buys when you're desperate to speed up the arrival of the biking season and satisfy yourself instead by sinking large quantities of cash into biking accessories). The DVD title is a total misnomer: Virtually no 'fundamentals' or instruction at all. It seems mostly to feature teenage boys (or maybe twenty-somethings) doing 20 foot jumps, drops, and crashes over and over to an annoying soundtrack.



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I read the road bike one and got a few good pointers from it.