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Rick Bavage turned his back on the corporate world last September, swapping a successful career as a marketing executive for an uncertain future building iPhone applications.

If you own an iPhone (or iPod Touch), chances are you've played Tapulous' "Tap Tap Revenge," a touch-screen and motion-controlled riff on videogaming's booming music genre. Apple recently revealed that "Revenge" is the third most popular free application on its App Store, and Tapulous Chief Executive Bart Decrem says half a million people play it every week since it debuted last summer.

IPhone app developer Tapulous says its sales have approached $1 million a month, providing fresh evidence of the growing success of start-ups designing programs for Apple Inc's mobile device.

Its iPods and iPhones wooed the young and tech savvy. But with its iPad, Apple may reach a new demographic: the middle-aged.