pCubee is an interesting hardware prototype from the University of British Columbia's Human Communications Technology Lab. It uses some clever hacks to use current generation technology to present you with a sort of 3D "tank" that you can look into.
We have designed a personal cubic display that offers novel interaction techniques for static and dynamic 3D content. We arrange five small LCD panels into a box shape that is light and compact enough to be handheld. The display uses head-coupled perspective rendering and a real-time physics simulation engine to establish an interaction metaphor of having real objects inside a physical box that a user can hold and manipulate. We have demonstrated four types of interaction techniques with pCubee: viewing a static scene, navigating through a large landscape, playing with colliding objects inside a box, and stylus-based manipulation of objects.
They went to the living room; Jill sat at his feet and they applied themselves to martinis. Opposite his chair was a stereovision tank disguised as an aquarium; he switched it on, guppies and tetras gave way to the face of the well-known winchell Augustus Greaves.
I'm hereby copyrighting the word "iCube" right now, so don't even think of taking that name for the next generation, three-dimensional iPad, Steve. Hold that in the palm of your hand.