Multitouch responsive interface for computer-based music

Multitouch Prototype 2 from Randy Jones on Vimeo.
One of the biggest points of interest for me is interface design, more specifically for synthesizers and computers. The keyboard concept is over 600 years old, so why is it still the main choice for modern synthesizers? This type of alternative interface is a nice move in the right direction, allowing for a means of physical expression that has generally eluded electronic musicians.