Jeff Atwood wrote a piece on bias lighting[0] for computer displays. I've been a fan of the idea and have been using the Ikea Dioder[1] colored, also in plain white[2], LED strips mounted behind my monitors both at home and work. It really makes things easier on the eyes when you aren't in a completely pitch-black room, not to mention the color effects are rather soothing. The Ikea strips are easy enough to mount to the back of monitors with a bit of velcro tape.