Ambitious young programmers have launched more than 100 businesses in the past four years with the help of Y Combinator, an angel fund that provides just four months' living expenses to help founders get their ideas off the ground. "The major value wasn't in the money," says Justin Kan of the $12,000 he received to help launch Justin.tv, a video sharing site. "... I would never have known that I could do a startup," said Kan, who moved into an apartment building dubbed the "Yscraper," where he could rub shoulders with fellow entrepreneurs day and night.

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