IK Multimedia AmpliTube iRig
What it is: The AmpliTube iRig is a guitar adapter for your iOS device.
What it's awesome: The iRig turns your iPhone into a pocket studio. With the advent of powerful yet affordable apps like Garageband and IK Multimedia's AmpliTube amps and effects offerings, there has never been a better time to learn guitar or to lay down some searing tracks.
Where to buy: Amazon