"While touch sensing is commonplace for single points of contact, multi-touch sensing enables a user to interact with a system with more than one finger at a time, as in chording and bi-manual operations. Such sensing devices are inherently also able to accommodate multiple users simultaneously, which is especially useful for larger interaction scenarios such as interactive walls and tabletops."
...but click here (and watch the video) to see why it's about the coolest technical development for years.
Just think about the possibilities for a moment.
And, less ambitous, but almost as lovely: The touch-sensitive dinosaur.
Send me some money please? I'd love to buy one of these (ahem) for the kids, of course.
And while we're on interfacing, this one's for all those DJs out there (you'll need your speakers on for this)
Finally: teasing Germans
There are nice ways of joking about Germans.
Hat tip for all of these to Charlie (apart from the scratching - thanks for that Benjer)