I need to send this to every person who tells me about their amazing iPhone app idea. Angry Birds was a different take/execution on an idea from an old Flash game. Doodle Jump was nearly the SAME app as Super Papi Jump but with new graphics and execution. How many unit conversion apps are there? The guys who made Convert were the last app to do it but they went to #1 thanks to brilliant execution. Fart apps? I'm friends with the guy who made the #2 fart app, and I can bust his chops all I want, but he's now a millionaire.

In the App Store it's actually rare for a mega hit app or game to truly be original: they're all mostly riffs on existing apps or games.