Via mikegao85 on YouTube:
In case you missed it over on Synthtopia. How bad-ass is this? Vocal Beater is an iPhone app that lets you "beatbox" a rhythm with your mouth, which it then turns it into a MIDI file you can load in to your sequencer of choice. Anyone used it yet? I can definitely see the next stage of this allowing you to turn your singing into an e-mail-able MIDI file in case you get a melody idea when you're out and about.