Ever since he started Box in his dorm room in 2005, Levie has been running around (in bright red sneakers) trying to convince the world that enterprise software is cool. It appears his evangelistic approach is working. Box's file-sharing service for companies has amassed over 180,000 corporate customers, including P&G and Toyota. Sales are on track to more than double this year, and Levie has opened offices in Paris, London, and Munich to help boost sales overseas. The company has raised close to $300 million in funding, and many say it may go public sometime next year. Fun fact: In one summer Levie was rejected by Google, Goldman Sachs, Lehman Brothers (phew!), and Napster (phew!) for internships.