[ventowtf]

I've seen something like this for Palm treos using the camera but I would imagine that would introduce more of a battery drain then we already have. Without a built in ambient light sensor the only mechanism to catch a change in light would be the camera.

But for simple dimming instead of entirely shutting off the backlight I would imagine an ambitions mortscripter could whip something up to dim the light 2 notches after a set amount of time.