Researchers at USC have taken another step towards that holiest of sci-fi dreams: the 3D holographic display. Using a spinning mirror covered with a "holographic diffuser," a special DVI implementation, and a high-speed projector, the team's device can project a three-dimensional image that can be viewed from 360 degrees.
http://www.engadget.com/2007/08/31/researchers-develop-a-360-degree-holographic-display/