Making Millions, 2 Bucks at a Time

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The iPhone app has created a new kind of entrepreneur.
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After just nine months, Apple announced recently that its iPhone app store had topped a billion downloads. The apps run the gamut from brilliantly utilitarian to blatantly absurd. But they all have one thing in common: Anyone with the right combination of tech savvy and business sense can make a killing creating them. Meet five entrepreneurs who are already on their way.