Nocturne
If you use your Mac at night or in low-light conditions, eye strain is probably a concern. While turning down the brightness of your display can help, sometimes you need a more powerful way to reduce the intensity of your screen. Enter Nocturne, from Blacktree. While I don't use their flagship product, Quicksilver, I do find Nocturne to be quite a useful application. It lives in your menu bar and, with a couple of clicks, allows you to set your display to "Night mode." Doing this changes all colors to grayscale and then inverts them, leaving you with a screen mostly comprised of white text on black or grey backgrounds. Coupled with a lower brightness setting, this is a perfect solution for reducing eye strain at the computer.
