(Internet Archive) has been shut down, five years after Apple purchased the company. MacRumors postulates that the closing might have to do with the upcoming tablet (+multi-touch pad peripheral?) device that Apple has planned.  They note the following from an old press release that may perhaps be relevant:

The MacNTouch Gesture Keyboard is a complete user interface that serves as mouse, standard keyboard, and powerful multi-finger gesture interpreter. Mouse operations like point, click, drag, scroll, and zoom are combined seamlessly with touch-typing and multi-finger gesture everywhere on the MacNTouch’s surface.
People are amazed by all the things a hand gesture user interface provides. We have a large number of easy- to-use gestures that cover just about every common computer operation. Users don’t have to reach for hot-keys because gestures are faster and easier to do.

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