Make Any Object Touch Sensitive via Sound
Johnny Lee (the dude who is the Trickster god of Wiimotes-- KokopeWii?) has an interesting post up on his blog, Procrastineering, about a French company's tech which can make any sufficiently hard surface a touchable interface.
This is the sort of thing that comes along where you watch the video, and then just start looking around your room/office/garage/parts bin trying to figure out new ways to mess around with all your existing stuff, junk, widgets, jobbies, and kipple.