Don't be discouraged that you haven't gotten an answer all day - it has been really slow around here today (we must be getting near "crunch time" on project feasibility or something).
Anyway, I'm sure you have gone to the Burning Man web site and looked over the possibilities as far as the camps that have registered and seen what may or may not interest you. Usually they have contact information attached to the camp description. There are also posts here in "2007 Theme Camps" that invite participation in this or that camp in the process of being formed. Finally, Another way to find something is to let it find you. We were invited to join a camp because of the interaction we were having here on ePlaya. Read up on what is going on in the various strings and make your opinions (and, more importantly, your personalities) known to the other "residents".
Good luck and Welcome Home!