Here's a project from a team at MIT Media Lab's Tangible Media Group called Recompose. It's an actuated 3D display that responds to gestures with haptic feedback. At its very basic Recompose is part keyboard and part display surface. It sounds a little confusing, but watching the video makes it pretty clear. 

Below is a schematic with various gestural responses.

As a researcher, I would love to use a display like this when presenting data of some kind. It would also be cool to hook it up to my iPod and watch the surface create a wave that matches the beat of the music.