The last few days I've been working on a set of software toys for seeper's new multitouch table, specifically for a book launch for airside. The book is a retrospective of the last 10 year of their work. It got great feedback.
There were 3 modes,
1. Cat mode where little cats crawl around in the grass and you have to hit them on the head to get points.
2. Physics simulation (pictured) of an artwork they had. You can throw around the various elements and spin them, crash them together etc.