Utterly fantastic. Joypad is an iPhone app that operates as a virtual, touch-controlled gaming pad for emulators on your Mac. All you do is run a free helper program under OS X, launch the iPhone app and you’re ready to crush some Koopas. It seems to work pretty well, and at $2, is cheaper than even the most remedial USB pad you can find. You may not be able to play emulated games on your iPhone, but that’s not to say you can’t control them.
[via Gadget Lab].