Mind-bending "two-way viewing-angle LCD"
Check this out:
www.boston.com/business/technology/articles/2005/07/14/sharp_develops_two_way_viewing_lcd
The fact that it costs twice as much as a standard display is unfortunate, but I've heard two interesting ideas for future applications. Imagine such a screen in the dashboard of a car, where the driver sees maps/directions, but the passenger watches a DVD! Or... imagine a multiplayer Xbox game where the screen no longer has to be split!