Watch it in action on this New York Times video clip. In case you're thinking of buying one, you won't get a chance, since it was built as a one-of-a-kind instrument. You can read more about the instrument and its history at Fortifi@.
(Via the well tempered blog)
Update 7/18/07: A review of Christopher Taylor's double-keyboard performance of the Goldberg Variations at the Caramoor Festival can be found in today's NY Times.