I have been dabbling with Sketchbook Pro (among other drawing apps) on my Mom’s iPad lately. I have to say it’s pretty fun to work with. Not quite a Wacom tablet killer, Sketchbook has a few limitations, but it certainly has it’s uses considering the price difference between the two. Sketchbook just needs to support larger canvases and it’ll be golden.
When the next generation iPads come out next spring, I’m going to have to look into getting one. For a device that doesn’t really have any uses, it certainly is a lot of fun to play with.