The City and County of San Francisco has a new open data site:
Please follow the link to the site to search, browse and view San Francisco data.

Description: Site Build It (SBI) is arguably one of the best web site creating tools out there. Its brainstorming tool does the tedious market research for you - it finds the most profitable niche and provides you with related keywords and topics. No other site builders anywhere on the web can provide this kind of service

DataSF is a clearinghouse of datasets available from the City & County of San Francisco. Our goal in releasing this site is:
(1) improve access to data
(2) help our community create innovative apps
(3) understand what datasets you'd like to see
(4) get feedback on the quality of our datasets.