Kyle Lambert is what one can qualify as an artist hyperrealist. Here is what he achieved on a iPad with only one finger.
(http://i49.tinypic.com/5xv6t2.jpg) (http://www.kylelambert.co.uk/ipad/beyonce)
Do not be mislead, this neither a copy nor any preset screen, all has been made "at the finger level" you can see a video of the realization of this drawing by clicking on the above image:
More than any publicity or declaration by Apple, this is the proof that the iPad is a little more than a supplementary machine. It really allows those who have talent to create things.