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Dropbox

Thanks to its elegant interface, deft courting of new users, and a knack for putting its cute box icon everywhere, Dropbox keeps growing, even as it competes with Apple and Google. Its growth--revenue reportedly exceeded $100 million in 2011, driving the company to profitability--can be credited with making file storage kind of cool. From the start, says CEO Drew Houston, "we focused on creating a service that just works." So far, so good.