Getting started in mountain bike racing?

I'm re-entering the world of off-road riding after a 15 year absense, and am interested in finding out more about racing.

I've been having a really hard time finding information on local mountain bike racing. Plenty on road racing, but asside from finding videos of downhill races, I'm not turning up much dirt on the dirt... :D

Can anyone point me towards any articles or sites that contain basic information about what different types of races their are, how classes work, how to find races, and what you'll need to know before entering this side of the hobby?

Thanks!
~Ben

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