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: Calls for service regarding criminal activity (unverified)
Agency Name: San Francisco Police Department
Time Period: Last 30 days
Frequency: Daily
Location of dataset:
Format: XML
Additional Details: Must agree to terms of use by clicking on button at bottom of page before downloading dataset

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.