Tristan pointed out this project at the NYU Media Research Laboratory that has developed a multi-touch sensing interface, enabling users to interact with a system using more than one finger at a time. The interface uses frustrated total internal reflection to enable chording and bi-manual operation, while accommodating multiple users simultaneously. This could be useful for larger interaction scenarios such as interactive walls and tabletops. The site has a demo reel (MPG) and still photos of the interface in action.
