I'm a jazz guitarist. I host a weekly jazz jam. The app iRealBook completely justifies owning the iPad for me. I've used my iPad for my last 3 jams/gigs and it works great. The wonderful thing about iRealBook is it's ability to transpose the chord charts into other keys INSTANTANEOUSLY!!! All the other apps, games, books, videos, etc are just gravy for me. If they never upgrade the ipad or create any new apps, i'd still be happy. I used to lug a 10lb binder and the charts were static of course, no instantaneous transposing. Any other apps that are this much of a game changer? Surely symphony orchestras will be moving en masse to the ipad?