AdjBrightness adjusts screen brightness for *rooted* android device. It can set the brightness from 2 ~ 255 and lock it so that most of other applications cannot change it. Alternatively, if you don't want to lock the brightness, "auto restore" option can restore it after screen turned on.
It also can turn off the background light of buttons.
Saves the battery and eyes!
Anyway, IF YOU ENCOUNTER ANY PROBLEM, REBOOT!
It can be downloaded from market or just download the attachment.
More information: http://blog.deskangel.com/?p=350.
Download the latest version from android market:
fixed bugs for Android 1.6 system.