Call it app flipping, re-skinning, or just good business, the best way to enter the market is to hit the ground running.

In other words, leverage the work that someone else has done by licensing or purchasing source code. My drug of choice is Apptopia because you can get an app in the store immediately before having to re-skin. If you go to another source code marketplace, you have to re-skin the game before you can launch. It just adds time to your bottom line, although sometimes you can get powerful engines for cheap. Also, if you can get a universal (iPhone & iPad in one) you’ll have a big boost in revenue.