Carnegie Mellon Human Computer Interaction PhD (and self-proclaimed "Procrastineer"), Johnny Lee, rocks another Wiimote based UI hack.
Following his finger-tip tracking "Minority Report"-like Wiimote hack we covered here, he now has another great hack he calls Head Tracking Desktop VR by which his head movements (right/left, up/down, forward/back) result in a change in the display similar to looking through a frame/window. Creates a great sense of depth!
We're still not quite beyond the mere interesting, and into the truly life-altering, but I suspect you can see it from here. Go, Johnny, go!
ps: Turns out Johnny is quite the renaissance man. His photography portfolio can be found here.