> an email with such a device. What a cure for overposting! (for the abled,
> how about eyetrackers? anyone know what the state of that technology is?)
There are eyetrackers which evaluate corneal reflexes (NIR LED
illumination) with a CCD. A new brand is actually using EOG
potentials. Both are not terribly precise. The latter is much cheaper.
All are only prototypes. Eyetracker will probably spill into the
mainstream once the HUDs will be there -- which shouldn't take than a
few more years.