Also, SF is expensive, and if you are staying somewhere expensive in the city while trying to find a job, you're doing it wrong. Move out to Oakland/Berkeley or even Hayward/Fremont, one of the other cheaper places and stretch out your money til you find a job... Then be prepared to look for a place to live, which is harder than finding a job in my experience... Especially if you are out of money by the time you get a job and don't have enough for the deposit of wherever you live.
Be prepared for things to take a long time, and with that in mind try to stretch out your money.