Great kids' toy or cynical attempt to keep selling pens and paper. You decide. There are a few things I know about kids. One is that they never stop screaming or wanting something. The other is that they press really, really hard on my iPad screen, which is why I no longer let them near it.
If you are a breeder, however, and can no longer endure little Johnny's wheedling pleas to let him play with your iPad, then you might consider the Trace & Draw from Crayola and Griffin.
The toy consists of two parts.
Gadget Lab, Crayola Trace & Draw Turns iPad Into a Sheet of Paper