This is an enhanced version of the "BlackBerry as a Flashlight" type program. For all devices it simply puts up a screen and sets the backlight to 100%. For devices with a polychromatic status LED like the 81xx, 83xx, 88xx (and maybe others), it will set the status LED very bright.
OTA Download:
www.troybrownpc.com/freelight.jad
Free (as the name suggests)