Sites for finding roommates in SF

Young professional in the tech industry planning a move up to SF from MV in the near future, looking to pick up a roommate so that I can find a place that I can afford in a quieter neighborhood.

Willing to pay a fair amount, but am having trouble finding roommates except via craigslist.

Are there any sites out there that exist to match people in the hacker community with others who might want to room with them?