The human eye can see the most detail towards the center of its field of vision. Anywhere else, and I vaguely determine color, at best.
So why does computer software and hardware render the entire screen all the time? Unless I'm looking at the Start button or the clock, I can't read them.
This becomes even more interesting when you think about high-performance video games. The AGP bandwidth can be saturated transferring data and issuing commands regarding parts of the screen I can't really see.
I propose integrating eye-tracking hardware with video drivers in order to only concentrate on the area of the screen I'm paying attention to. Of course, there are technical limitations like refresh rates. My eyes can pan from the top of the screen to the bottom faster than my monitor draws. But that can be overcome with future development.
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Perhaps if it reduced the resolution in the "remote" areas of the screen it might be workable.
I would guess that gaze tracking hardware is a bit out of reach, price-wise, for the average consumer. If it became ubiquitous, I'd like to use it for controlling the pointer or something more functional.