CleanOffer.com is the most complete MLS search service for consumers to search for homes for sale in San Francisco, and it allows you to save favorite listings and set up email alerts for specific searches. In addition they product Trend reports on the market.
The complete 2007 report is now available at this link. Interesting to see the trends for the past 7 years. The only segment of the market that was down significantly in '07 is the "Southwest" Condo market. Meanwhile, the "Northwest" market was up significantly.
If you'd like access to MLS searches on CleanOffer it's an invitation only service, but you can invite yourself at my specific link here.