Known for serving San Francisco's best breakfast, Mama's varied menu extends to rarely seen dishes like a Dungeness crab omelet or French toast made with fat-free apple yogurt cinnamon bread. But there's a catch: You have to be willing to wait an hour and a half for a table. Most people are put off by the lines, with one person telling us, "There's the food, and there's the wait, and I'm not sure they are even close to being in balance." It's less crowded at lunch, when you can order one of the city's best hamburgers, along with salads and a number of dishes geared toward vegetarians