I have been working for a week in a project for iPhone and iPod Touch.
I ported the Chip-8 Emulator I already did for J2ME enabled cell phones to the Apple handhelds.
Chip-8 is an interpreted programming language used on the COSMAC VIP and Telmac 1800 8-bit microcomputers in the mid-1970s.
I decided to release the emulator completely free, bundled with several public domain games!! Get it from here.