David Newman administs a Flickr pool called San FranGone: The City as It Was. Here you can find photos, postcards (such as the mid-a960s cable car above), and maps ranging from the nineteenth century to fairly recently. Newsom says:
Please post your image in this group if:
You can’t go there anymore (i.e. Playland-at-the-Beach)
If the person, place or thing has changed significantly since the image was made (i.e. SF Bay with ferries, before the bridges were built)
This sheet music cover dates from 1917.
Hanging out on Haight and Masonic during the Summer of Drugs Love:
My publishing company used to occupy the entire first floor of the tower portion of the Call Building, the tallest building, I think, to survive the earthquake.
The pool has some limitations. A few posters somewhat overwhelm the rest, and there are quite a few more pictures of someone named Leo than I really need. While the pool is fun to browse, it is very difficult to find anything in particular. I think the pool should be subdivided by decade, subject, or neighborhood.
For more click on the screenshot below.