Partner, 37signals
Age: 27
As the Web's second boom expands, so does the importance of the software tools that make it all possible. Chief among them is Ruby on Rails, an open-source framework used by Web 2.0 sites from LinkedIn to Twitter. Hansson, who created Ruby on Rails in 2004, is an outspoken Mac fan, a stance which has been rewarded well. Apple plans to ship Rails later this year along as part of Leopard, the newest version of Mac OS X. Age: 27
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