Dozens of efforts are underway to provide access to the history of San Francisco on the web.
Here are some of the more useful sites we've discovered (thanks to Ron Henggeler for a number of these).
Please write us with your url if you have something that should be on this list.
OpenSFHistory.org Historical images of San Francisco—50,000 and counting!
SFSU American Poetry Archives An historic register of the past 50 years of poetry and related writing as it happened in San Francisco
Museum of the City of San Francisco (particularly the '06 quake and fire dept.)
Specific Neighborhoods, Areas, or Neighborhood Historical Associations
Curious and Entertaining Local History Sites
San Francisco Film Locations Then and Now A Then and Now Tour through San Francisco using film and photography
Using San Francisco History a fine historiographical collection of blog entries relating to San Francisco history
Up From The Deep photo essays documenting the past and present of San Francisco's central city