Microsoft's Bill Gates may get all the coverage, but he shares credit for founding Microsoft with Paul Allen. Though less recognized, Allen's role in turning the company into what it is today cannot be overstated. He came up with the Microsoft name, and he brokered the deal to put the operating system that his company owned into every personal computer manufactured by IBM .
Allen stepped down from the company in 2000, but not without walking away with 138 million shares. Today, he has a net worth of $13 billion, and he used some of that money to buy "Octopus," a yacht that he bought for $200 million . The yacht is more than 400-feet long and is outfitted with a basketball court, a hot tub, and, of course, landing pads for two helicopters.