Some friends and I are gearing up for a tour of San Francisco's best drive-in style burgers and are looking for suggestions. We are aiming for the old time, pre-chain, fast food variety (eg, Doggie Diner, Whiz Burger) rather than a typical "best of" which might include semi-gourmet examples (eg, Bistro Burger, Barney's). Here's what we've got so far - please send in any favorites we might have missed, and thanks!
Joe's Cable Car
Tony's Cable Car
Also, I'm sure there are some good non-city places, but we're going to start local, then branch out.