They are finally getting close to building free-standing computer displays. And when I say free-standing, I actually mean free-floating:

“The Heliodisplay prototype display system, invented by a 29-year-old Massachusetts Institute of Technology graduate student, modifies the air above a video projector, creating a working, 27-inch screen that can display any kind of video. The image is two-dimensional, can be seen from several angles, and can be manipulated by hand.”

Man. I wish I invented that! I would become so astronomically rich!