Our buddies over at Perceptive Development have pulled off a stellar hack: they've hooked up an external keyboard to an iPhone using an audio modem implemented with a $20 micro-controller.

The result is a way of communicating with the phone using the Apple-approved SDK audio input, and in this case sending encoded keyboard inputs to it. So this hack can be done on a non-jailbroken phone... genius.

And the rest of the world agrees, including Wired, ARS Technica, and Gizmodo.

Nicely done fellas!