iBrightness

Besides allowing you to freely adjust your brightness level straight from the menu bar, iBrightness sits in the menu bar, waiting for your Mac's power source to change and then re-adjusts the screen brightness according to what you have previously set.

No more guessing if the screen will be too dim when you move away from the power socket, or if it will be too bright because you turned to the power adapter. iBrightness is here to keep the guessing game away.