We haven't had a chance to test this out yet, but ZodTTD just released version 0.0.5 of gpSPhone, a GameBoy Advanced emulator that lets you play Gameboy games right on the iPhone. This is one app that is definitely for the advanced users, as you need to supply your own BIOS and you need to supply your own games in ROM. Playback is also not entirely smooth either. But hey, if you feel like having a crack at playing Mario on your iPhone, you can feel free to give this a try. (Source: TUAW)
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