-The Vespertine Circus
-SparkleTack :Great blog and podcast on our unique city by the bay.
-OLDSF : Plethora of pictures from long ago.
-Sepia Town :Not only San Francisco, but many many old images.
-San Francisco Museum and Historical Society
-San Francisco History Association
-What's on the 6th Floor : SFPL's History Center/Book Arts and Special Collections Blog
-San Francisco Public Library History Center
-FoundSF :Shared history of our city.
-Western Neighborhoods Project (Outsidelands) : History of the western half of the city, often times having walking tours.
-California Historical Society : Large collection on San Francisco
-San Francisco Maritime National Park : Living history, museum, ships...
-The Virtual Museum of the City of San Francisco
-Using San Francisco History
-Whatwasthere : images now and then
-Map of the buildings of the Sutro Baths
-Laborfest: History of local labor.
-San Francisco Postcard Club
-Fort Point Garrison Brass Band
-The Kingom of the West
-The Shire of Cloondara
-the 20th Maine
-Victorian Alliance of San Francisco
-Art Deco Society of California
-San Francisco Architectural Heritage
-Bay Area Vintage Base Ball League
-SF Tweed Ride
-Bernal History Project
-Potrero Hill Archives Project
-the Aether Brigade
-Guardians of the City
-Roamlocal - walking tours with one of the most entertaining and brilliant tour guides.
-SF City Guides - many different walking tours that happen all the time. Many different areas of the city and many victorian related. Free.
-Emperor Norton's Fantastic San Francisco Time Machine
-Drag me Along Tours - Tours hosted by Countess Lola Montez
-Chinatown Alleyway Tours
-Dashiell Hammett Noir City Tour
-Victorian Home Walk
Socially Awesome (not necessarily steampunk, but worth a gander)
-Alien Corset (silkscreen posters by David O'Daniel)
-SF0.org (games played in the world)
-Timeless Tailor, amazing creator of garments.
-Michael Shindler Studio
-The Vespertine Circus
-Sameul Peaches' Periptetic Players
Non San Francisco steampunk groups:(this is no where near a complete list)
The Steampunk Empire (everywhere)
Bay Area Steam Federation
Sacramento Steampunk Society
Foothill Steampunks (Sierra Foothills)
San Diego Steampunk
Portland Steampunk Society
Steampunk Society of Massachusetts
Steam Century Minnesota
North Florida Steampunk
Steampunk Los Angeles
Washington DC Steampunk Society
Manhattan Kansas Steampunk Society
Gaslamp Society (Fresno)
Airship Archon (Columbus)
New England SteampunksLouisville Steampunk
New Orleans Steampunk AmericansDenver Victorian and Steampunk Society
High Desert Steam (Northern Nevada)
A quick read on steampunkery (thanks Mary)