A display that doesn't have a screen? Sounds like it's straight out of a sci-fi movie. At the end it says that pundits claim there is no market out there. They obviously don't know the geek “I must have all toys!“ mentality. Personally, I think a thin-air display would be extrememly cool. Merge the 3D with the thin air and we'll have actual hologram displays!
http://www.floatingplanet.net/planetp2/archives/000322.html