If like me you sit in front of a monitor all day, your eyes may be pretty tired from all the light being blasted into your face.
Found two things that help with that.
1. Color That Site! plugin for Firefox - lets you adjust any color in a CSS, great for WYSIWYG style figuring out
what colors are attached to what. But it can quickly turn blogs, google, facebook, whatever into a nice black and gold scheme
if you so desire. You can save profiles and paste them for others to use. Works on forums.
2. f.lux a clock based adjustable monitor dimmer, also changes the color warmth of the screen, sits in the tray and can be disabled for color work.