File this under cool shit we probably won't see for a long time. Apple just recently filed filed an expanded patent application for a system that would detect hand/head motion around a computer and let you manipulate projected image controls.
The Nintendo 3DS is pretty great. A solid enough 3D screen with no goofy glasses. We need more stuff like that if 3D is going to take over our living room. And MIT agrees, but they think they got an even better way to push out glasses-free 3D.