I think we all know that Kinect hacks are growing like mad. This video from Microsoft Research shows how much the Kinect is probably going to grow.
You will note these very intriguing wedge optics to create an interesting type of 3D interface on a laptop. If the age of holograms is upon us, then this will be the way they are done.
The next thing is a 3D display that reverses the weird mirror device, and no glasses are required.
Feel free to watch the video if you want to see more.