Founded: 1998
First Address: 232 Santa Margarita Ave., Menlo Park, CA
Sergey Brin and Larry Page are the latest billionaires to get their start in a garage. But while Bill Hewlett and David Packard and Steve Jobs and Steve Wozniak worked on wood benches and dealt with cold drafts, Brin and Page enjoyed relaxing breaks in the backyard hot tub. The pair, who rented the garage from a woman who's now Brin's sister-in-law, bought the house last October to preserve this piece of the Google legacy.