The Ipad is a great gadget, but Ipad will be toast once some quality Droid pads come out. Users have to buy an addon application just to be able to print with Ipad.
I can print to my Canon MX850 just fine with my iPad running iOS 4.2x. Now I did have to download some OSX developer drivers that Apple took out of the public version of 10.6 x. The rumor is that a patent troll got after them and they pulled those drivers at the last minute.
I expect that issue to be resolved in a future release of OSX. I cant imagine Steve is happy about it.
... and what do you have to buy to be able to print on a vaporware tablet? Unicorns?