IO2 Technology :† Heliodisplay- Interactive Free-Space Display
From the site:
The Heliodisplay projects full color streaming video into free space (i.e. air). It is plug-and-play compatible with most video sources (TV, DVD, computer, etc.). These non-holographic images can be fully interactive, allowing a hand or finger to select, navigate and manipulate — as if it were a virtual touch screen.
How does it work…?
Here is another co. doing something similar:
http://www.fogscreen.com/