Does recording music get any easier than this? GuitarBud is a connecter that plugs your axe right into your phone, allowing you to record straight to any number of apps. Heck, you can just use the built-in voice recorder to lay down a melody you've got in your head. Or you can go a little more pro and turn your phone into a portable studio.
Sure, you probably won't want to record an entire album on this thing, but you've gotta admit that it's pretty awesome this ability now exists.