I got really bored today and downloaded this iPod touch / iPhone app. And it's really good, uploaded a video to Youtube with me playing a song on it. Enjoy lol, only made the video so you could see how it works and maybe tempt you to paying £0.59 for it!
I looked on Youtube, found some pocket guitar videos, but i have no idea which one is yours :P Posting the link might help. But indeed, it looks like a fun app. Though, i prefer a real guitar.
http://www.youtube.com/watch?v=6Vh_UETxW9k - sorry don't think i can link