Black electrical tape.
If your phone is rooted: Buy the dock. Download LEDs Hack from the market (Free) It will disable the top led, and softkeys when your phone is docked. and turn them back on when removed. (if you so choose). Good options in the settings. lets you pick and choose what, and how.
edit: so you can still use the clock if you want, without the bright softkeys
edit2: oh yeah, and if you use the brightness control app you can reduce the backlight considerably. its almost off and doesnt bother me when sleeping. ( im really sensitive to light, keeps me from the sleeping. with this option it works beautifully. i can still see the clock if i wake up, and i can sleep.)
Last edited by freeloader; 01-22-2010 at 02:09 PM.
That specific LED isn't located in /sys/class/leds/ so I'm not sure whats going on there...
I looked into some other areas and still couldn't find anything. I too feel it would be nice to disable this, I've noticed that the LED turns off when the phone is completely charged, I'm going to look into a method to make the phone think its charged, and turn the light off...but still continue to charge itself.