Hey rtf, I'm in the Bay Area too. There are _tons_ of meet ups, hackfests, and user group meetings you can go to.

SupperHappyDevHouse is coming up this Saturday (Oct 3rd) and the Hackers & Founders meetup is Oct 16th.

Usually the goal of these meetings isn't to find another founder though, it's just to have fun by hanging out and sharing interesting ideas w/ like minded people.

I think it might be a good place to start though.