gpSPhone is a GameBoy Advance emulator for the iPhone and iPod Touch. To use it, of course, you'll need an iPhone that's been hacked to use third-party apps, but that's a small price to pay for quality time with such memorable Nintendo classics as Mario and Luigi Superstar Saga and Mega Man Battle Network. The emulator was co-developed by the guy that made gpSPhone's cousin, a classic NES emulator.

Once you have gpSPhone installed, assuming you're willing to jump through the hoops required to unlock your iPhone, you'll need to get your hands on some games. Since the iPhone doesn't have a GBA cartridge receptable (those short-sighted Apple engineers!), you'll need to grab ROMs instead. ROMs are firmware images of cartridge games that can be downloaded and copied to the iPhone for use with the emulator. Only watch it, distributing copyrighted games in this fashion is mostly illegal.

That said, there are quite a few home-brew games available as ROMs, like our new favorite, Qwak. Now, if only an Amiga emulator would show up on the iPhone so we can play Lemmings.