I’m a massive iPad fan, using it every day for probably an hour or two at the minimum. I read my daily paper on it, do most of my surfing on it, plan classes while on the train, and also use a ton of music apps for my teaching. One app that I haven’t checked out yet (but plan on investigating after seeing this video) is Seline HD. Here’s a video of four iPads performing a composition titles Sweet Dream:
More info and videos available at http://ipad-orchestra.com.