WNAMM 2011 Line 6 MIDI Mobilizer

YouTube via HarmonyCentral | January 22, 2011 |

"Can you really make music with an iPad, an inexpensive app, and a $79 keyboard designed for games? Line 6's Marcus Ryle shows that you indeed can, thanks to their MIDI Mobilizer - still the only MIDI interface for iOS devices."
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Rock Band 3 Guitar is a MIDI Controller

Not only does the keyboard have MIDI, but the guitar as well. Via Create Digital Music where you'll find the full scoop.

"Since the very first Guitar Hero game, musicians have found ways of converting game music controllers into genuine music controllers, through various hacks and tricks. But now, no hackery is needed: Rock Band 3′s new “Pro” controllers ship with actual MIDI DIN ports on the back. With the help of Harmonix, we get to look inside how that MIDI implementation works."

Update: post on the keytar just went up here.