We've seen this idea before, just not applied to the iPad: Ten One Design's Fling, a suction-cup tactile controller for touchscreens, when your finger just won't cut it.
We know it sounds antithetical to try to analog-ize a touchscreen, but there are definitely applications that require more delicate fine-tuning than your sausage fingers will allow. Here they demonstrate it for gaming, but we believe this would also be invaluable for doing CAD on a touchscreen.
Lastly we hope the idea will take off, simply because we think it'd be cool if in the future, everyone carries a variety of suction-cup buttons and controllers in their pockets and uses them to interact with touchscreens encountered throughout the day.
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