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.

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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.