IO2 Technology has now put on sale a consumer grade holographic display system. The device allows you to project images on thin air.The image quality is inferior to that of LCD’s or CRT’s, but the technology is very promising and a work in progress.
Snip from the site:
The Heliodisplay’s projected image hovers a few inches above the unit. The top of the image is 28″ above the top of the unit. The enclosure is about the size of a tower desktop computer case turned on its side. Heliodisplays will work in well-lit environments such as hotel lobbies, corporate offices, trade shows, and also low-light environments such as museums and nightclubs. As with any display technology, lower ambient light makes the image easier to see.
The Heliodisplay is designed to be hidden (into a pedestal, table etc), so that only its projected image is visible. The display connects to a standard video source (such as DVD player or PC) and projects any images that would be viewable on a computer screen or television. No specialized hardware or software is needed to view images.