http://recombu.com/news/project-natal-style-interface-developed-for-mobile-phones_M11667.html
By Andrew Lim on Monday, 26th April 2010
Forget touchscreens. The University of Tokyo is developing an incredibly cool Project-Natal-style interface for mobile phones, which allows you to interact with a phone by waving your finger around. Members of the Ishikawa-Komuro Lab have used a high frame rate camera to track the motion of a finger and recognise input gestures. As you'll see in the video below, the touchless interface can be used to navigate around a phone's screen and even to type. We can't wait to see this interface on a commercial handset or tablet.
http://www.youtube.com/watch?v=8HXnjAyT3cM&feature=player_embedded