I've started to get headaches after prolonged use of the computer, and I just recently turned ClearType "On". I'm not sure if I can blame it (as in, turn it off), just yet. What does everyone think of it? (I have to admit, it makes all the fonts look a lot smoother).
EDIT: Official (Microsoft) ClearType Tuner (if anyone is wondering)
EDIT: Official (Microsoft) ClearType Tuner (if anyone is wondering)