How similar is the iPad sdk, and will this (does this?) work with that?

There is a game idea I never pursued because it involves the user drawing freehand lines to interact with, and I HATE drawing with the mouse so I never bothered pursuing it. The iPhone was just too cramped for it as well. The iPad is a great fit for it. Also, I had wanted to make it multiplayer, but hotseat on a pc is a pain for the end user, and drawing on a notebook/netbook with tiny pad and/or mouse nub is a nightmare. Passing an iPad back and forth to play a multiplayer game would seem very natural.

I am actually pretty interested in the iPad possibilities for developers, but it is missing too many features to get that interested in it as a consumer. Needing the dongle thing for an SD card and usb floored me, what a cludge.