OK, so this is how the whole TtV mystery works: You get an old camera, create a light proofing thing to block light between the viewfinder and your point-and-shoot digital camera. (You see it at the top of the contraption.)
How awesome. Now to go look on freecycle or kijiji for the old camera.
Also there's this blog with great links which should help in the building of my Ttv contraption. I'm on a mission!