I'd like to draw attention to the "Tips for Newbies" sticky thread in the racing sub-forum:
Tips for Newbies
I added a few new things today. As always, tips from people who actually know what they're doing (i.e. not me) will help make it a better thread.
I re-read it today. There's some good stuff there if you're new to cyclocross, and especially if you aren't really a racer but just want to have some fun in the dirt.