By the time you guys are here next year we will have a lot of clubs up and running. That said, if there's any club or interest group you don't see or we don't have then the administration is very supportive of starting clubs. Plus it sounds a lot cooler at an interview when you say you've founded a club than you were just a member. Anyway, off the top my of my head, we have...
SOMA, AMSA, Undergraduate American Academy of Osteopathy (UAAO), Emergency Medicine, Wilderness Medicine, Pediatrics, Surgery, Women's Health/OBGYN, Students for Choice. There might be a few more that I can't think of.
Hope that helps. And again these are just the clubs we've set up in the first year of the school, so if there's a club you want that we don't have you can start getting the information for how to set it up this summer from the national organizations or our student council (PM me if you want their contact info).