Apple's 'directional audio' concept is like multitouch for the ears
Apple has worked on "directional audio" technology, specifically employed as an audio user interface, allowing users to make selections and navigate menus based on audio cues in a three-dimensional surround sound environment.
http://feeds.appleinsider.com/click.phdo?i=80c5be1c1ff0534fffb745e6e9c67c1c