At the end of the "Creating Boom Blox" session at GDC, executive producer Lou Castle revealed that you can use two Wii remotes on your TV (and some form of do-it-yourself LED headset) to control the camera in Boom Blox with your head. Seriously.
Speaking briefly to Joystiq after the session, Castle explained that it was more of an easter egg inclusion and they weren't planning to actively promote the feature. We'll have more from the Boom Blox session later this week. After the break, a video of do-it-yourself head tracking.