I found this interesting thing that is currently being demonstrated at the GDC:

http://news.com.com/The+next+game+controller--your+brain/2100-1043_3-6165143.html

It reads your brainwaves to manipulate objects in a virtual world. It can also read your emotions. Apparently it works best with kids and people with good imaginations.

Pachinko a Go Go! Super Excite!