Thanks to Ruth & others here on this board for doing much of the bay area legwork; without them, I couldn't have gotten my map of California (and soon, hopefully, all over the US) going!
Right now I've got places I know about in Sacramento & environs, and have added Ruth's Oakland report - those that I've had locals verify are still extant - and I've had about two dozen recommendations for SF and southern CA.
Please do come & visit, hit the digg link and let me know of your favorites that I've missed - I'm sure there are plenty!:
I think that our own Jim Leff made a google map of street food in Salinas - I'll see if I can merge the taco trucks he has written up there into this map as well.
JLT, loyal chowhounder