edit: I have now filled out and submitted the volunteer questionnaire any other things I can do?
Click "Regionals" near the top right of the main Burning Man website and join the mailing lists for your area (or perhaps neighboring areas if you don't see yours well-represented). If you attend a local event or two, you may find a kinship with a local camp or individuals. This can result in getting to help with a local build, or finding campmates/rideshares. Plenty happens here on ePlaya too, but I wouldn't rely on it solely.
By February or so, the "2012 Theme Camps" forum will have more posts in it, and you can write a little letter of introduction offering your skills to camps that resonate with you (they will want to know why you'll mesh). Note: there are a lot
of DJs out there, so don't lead with that, unless DJing with a large sound camp is your primary goal (in which case research those, and pursue a slot right away, those opportunities go like lightning--if they're not already taken now).