I bought RockSmith last week for the PS3. This is the game where you can plug in a real electric guitar and use that to play the "game" rather than a cheap plastic guitar controller. I was skeptical how well it would work, but after a few hours of trying it out, this thing is great!
I bought a starter Epiphone guitar/amp about 5 years ago and scoured the internet for video lessons. Over the next few months I learned how to play a few chords and a couple of scales and then my interest faded because I just wasn't progressing like I wanted. With this game, in ~4 hours of playing it, I can play large parts of a couple different songs and it's awesome! Sure, it's not teaching me the perfect technique, but it's teaching me to play and it's teaching me to read what note to play and train my hands to play it. I love it!