Do you need a yummy cake to feed a crowd? One South Bay option is Prolific Oven, which can make you a large sheet cake of very good quality. jkg notes that if you’re not sure which flavor to get, they sell slices, so you can do “research.”
katg likes the Asian-style cakes sold by Sheng Kee Bakeries, with light, yummy frosting and fruit inside. They sell cakes big enough to feed 25-30 people.
And Lori SF likes the cakes at Fleur de Cocoa.
Sheng Kee Bakery [Citywide]