I posted this link in the Upgrade issues thread but thought some might not be reading that thread so I decided to post a link here.

If you're having issues with the brightness of this place or any other place on the net, DL Flux. It adjusts to the time of day & amount of daylight, it will even change for Daylight Savings Time.

http://stereopsis.com/flux/

At a certain time of day the screen will have a nice sepia tone that's so much easier on the eyes. I use it at work & on the laptop at home.