Even though wizard101 isn't supported by mac os x, or snow lepord, Ipods and Ipads run on a different operating system, that is similar, but designed pacifically for there touch screen.
Since the Ipad has a large screen, game playability would be very easy. This app would let you play wizard101, just like you would on your PC. I think adding "touch" to the game, rather then "click", would be a very unique and magical experience.