The world's first interactive 3D display has been developed by IO2 Technology.
( From bink.nu ) HelioDisplay creates 3D displays in the air using lasers, drawing input from computers, TVs and DVDs. It also allows interactive applications to be controlled by a finger, instead of a mouse.
"Our first generation version, the Heliodisplay, projects TV, streaming video and computer images into free space, (mid-air)", the company's website claims.
While it's early days for such technologies, the company has just completed its first production unit and claims it is ready to release a limited number of units for sale. IO2 Technology : HelioDisplay Page