[youtube]http://www.youtube.com/watch?v=5s5EvhHy7eQ[/youtube]

“Any part of the keyboard surface can be programmed to perform any function or to display any images.”
[youtube]http://www.youtube.com/watch?v=rUSTXUis_ys[/youtube]
from: www.evilmadscientist.com
[youtube]http://www.youtube.com/watch?v=AICq53U3dl8[/youtube]
[youtube]http://www.youtube.com/watch?v=kzGljuievpM[/youtube]
Control 3D environments with real objects.

FaceResearch.org allows you to participate in short online psychology experiments looking at the traits people find attractive in faces and voices.

[youtube]http://www.youtube.com/watch?v=Tq8Yw19bn7Q[/youtube]
via New Scientist
This is one of the better real-world examples of an effective way finding system integrated within an overall public space redesign project. Link from Chris Moorehead.