Plug your guitar directly into your iPhone.
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.
GET IT at PRSguitars.