If Ranjith Kumaran can't tell from his balance sheet that he's onto something, he need look only at the burgeoning competition. Kumaran founded YouSendIt, a service that helps users send files too big for their e-mail allowances. The business is booming, thanks to the growth of digital video and the shrinking of corporate IT departments. "We think we'll thrive in this economy," says Kumaran, who dominates the market with 8.8 million users.
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