Touché is an open-source multi-touch tracking environment for Leopard. It has been designed and written specifically for MacOS X Leopard and uses many of its core technologies, such as QuickTime, Core Animation, Core Image and the Accelerate framework.
The Touché environment consists of two parts: A standalone tracking application written in Cocoa, that comes with lots of configuration options as well as calibration and test tools, and a Cocoa framework that can be embedded into custom applications in order to receive tracking data from the tracking application. This way, you can easily experiment with MacOS X technologies such as Core Animation or Quartz Composer on your FTIR multitouch table.
It’s pretty impressive stuff, but is dependent on a FTIR screen which it looks like you have to build yourself unless you can find someone to do it for you. However this might be an excellent 10% project at work for me, some of the modes of interaction I’ve been experimenting with for navigating large graphs of data would be more intuitive with a multi-touch interface … wow … *me has a cunning plan*.