Guitar Chords Lite: Handy reference for guitar chords.
Thum Drum: I can't really get this to function that great. Does not have very good response.
TED: I love TED, but this app is quite hard to use. Not searchable.
Smule Piano: First app I spent $ on. Cool, but I don't get the point.
Glee: This could be very useful. I could see a "Glee Club" happening with this app.