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.
Shaping San Francisco Talks: online archive
Shaping San Francisco upcoming Bicycle History Tours
History Pin's photo crowdsourcing project "Year of the Bay"
Shaping San Francisco channel at History Pin
Thinkwalks on foot and bike with Joel Pomerantz
David Rumsey Map collection, 1859 US Coastal Survey Map geosynchronized with Google Maps!
The Photo Archives at the History Center
San Francisco Public Library History Center
OpenSFHistory.org Historical images of San Francisco—50,000 and counting!
California Digital Newspaper Collection
San Francisco City Guides--Neighborhood historical walking tours
Maritime Museum National Park--Maritime History
Labor Archives & Research Center, SFSU
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.)
San Francisco Historical Society
San Francisco LocalWiki history page
San Francisco Architectural Heritage
Urban Life Signs Forgotten Hills
Specific Neighborhoods, Areas, or Neighborhood Historical Associations
The Uptown Tenderloin Historic District
Mt. Davidson and its Historic Neighborhoods
Glen Park Neighborhoods History Project
San Francisco and Haight-Ashbury history
The Historic Shipyard at Pier 70
Visitacion Valley History Project
California Missions: Mission Dolores
San Francisco Garden Registry: A Survey of Urban Food Production Zones
San Francisco History Association
San Francisco African American Historical and Cultural Society
Chinese Whispers storytelling project
Muwekma Ohlone Tribe Information
Thomas Fleming on Black History
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
Burrito Justice, one of the best local bloggers, full of history and sharp insights
San Francisco History Podcasts from Sparkletack
Tramps of San Francisco: In search of San Francisco's forgotten histories
Kenneth Rexroth's San Francisco
Who's Who of "Haight Ashbury Era"
Malcolm Barker's San Francisco Memoirs
The Bay Area's Lost Streetcars
California Landmarks: San Francisco
Thomas Bachand's 360 degree animation of San Francisco in 1851
The Armada of Golden Dreams: Buried Ships Beneath San Francisco
Digging in downtown SF c. 1978
Oakland LocalWiki history page
Berkeley LocalWiki history page
Up From The Deep photo essays documenting the past and present of San Francisco's central city
Tenderloin San Francisco: Hardboiled Stories from San Francisco's 1960s and 1970s Tenderloin