A friend of min introd'ed me this weeked to an app in the Android Marketplace called Rom Gripper. May be available in the iphone store as well, but I have doubts. Anyway, download and install, and you'll have all the games at your fingertips from many systems like the Atari 2600, NES, SNES, Genesis, etc. If you want to play a game, choose what you want and it will even download and install the emulator if you don't have it as well. Here's some actual screens I grabbed from my phone. Enjoy.