There are lots of vacancies now. A friend moved a couple weeks ago, and it only took him a week to find his ideal apartment in the Mission.
My lease is up March 1st, and my landlord just offered my free rent for March if I sign another 12-month lease, and a $300 credit for April if I signed the lease by January 26th...which I did. I *was* thinking of moving to be closer to downtown, but this was simply too good a deal to pass up. Granted, I live in a 720-unit complex with alot of vacancies, and I doubt landlords of smaller complexes are giving out such good deals.
But this seems like a good time to be looking for a place to rent. Yeah, popular neighborhoods will still be pricey. But I imagine you'll find something good.
Like batboy said,
www.craigslist.com is awesome. And once you get settled, you can use it to find activity partners, groups, jobs, a f**k buddy eek! and so much more. Craig's List seems to have put all those old rental agencies like Metro Rent, et al. out of business. The only problem with CL is that that is where everyone looks. So, even in this renter's market, if you pursue a great listing, be prepared to fight for it with many other prospective tenants.
I agree with MPetrelis. Take paper and a pen and your cell phone and walk around the neighborhood where you want to live. I think landlords in this city know they only have to put out a "For Rent" sign and they will get lots of bites.
Good luck and an early welcome to SF! The weather is supposed to be simply perfect when you're here later this week. You just missed the rain.