Noted: This App Teaches You How To Play Almost Any Song You Can Find Online And It's Awesome via Business Insider
The problem is, I've run out of songs to play that are remedial enough for me to learn. That's where Riffstation Play comes in.
The online app gives you the guitar, ukulele, and even piano chords and notes to pretty much any song you can find online. It even includes a search engine.
The chord diagrams are on the right, while a bar displaying the chords scrolls below. It syncs to the video.