A few months ago, I wrote a post about multi-touch "NuMTyPYsics". Here is an update:

Below is a video that shows how two use two single-touch Nokia Internet tablets to provide an emulation of multi-touch input for NuMTyPYsics, a drawing game that based on Numpty Physics:


Here's the description from Perlinet's YouTube channel:
"Using two single-touch tablets and a laptop running NuMTyPYsics, it's possible to emulate multi-touch input (max. 2 cursors - one from each tablet). This allows for precise input control and testing multi-touch applications. More info: http://thpinfo.com/2009/mt/"

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The game is also based on Crayon Physics, using the Box2D engine.