I was playing with a friend's iPad at the weekend, and Rock Band for iPad is actually very good. It felt quite natural to me - managed to play Megadeth's 'Peace Sells...' on Expert.

Still not persuaded to get one, but that is the single best thing I have found so far, even beating the ebook reader, which is so much better than the Kindle and the Sony offerings.

If it was £100 then I would get one now.