Haven't been on
Chowhound for a while but I always love these threads on "the best xxx in whatever area". Recently,
burger in the financial district/downtown. The recommendations:
Zuni,
Taylor's,
Royal Exchange (avoid Bistro Burger), and a bunch of sit down places (which is kinda ehh to me)
I'm partial myself to the
Burger Joint or
Kelly's (neither are downtown)

Here are some
sf burger pics from Flickr
Credits
http://flickr.com/photos/matthewa/11636320/
http://flickr.com/photos/thatkidinthecorner/138779355/
http://flickr.com/photos/spine/109972054/