So my first film camera was the Canon EOS A2E. That 'e' was cool, because it actually had IR sensors that could see which way your eye was looking (in the VF) and would pick that particular focus point.
(I'm still wondering why this isn't possible w/dslr's...but something tells me that there's too many IR beams bouncing around inside the camera, and some of them inevitably end up registering on the sensor...)

Now, it turns out that Canon is to be using the eye again, to help the photographer w/copyrights! check it out: IRIS

Hopefully soon, we can protect our copyrights...and feel like James Bond!