Printed organic sensor company ISORG demos its first product in these Youtube videos:
This bar graph applet illustrates what the ISORG organic sensors "sees" on top of the tablet, it estimates a relative distance to the object on top the pad by the amount of light each pixel receives:
Virtual disc with a touch-less interface:
Thanks to SG for the link!
Update: Here is Photonics 21, Sept. 2011 presentation by ISORG.