This is where Apples "we want to make things simple for the user" policy goes too far, IMHO. Why on earth aren't there controls for changing display settings like gamma, brightness and contrast in OS X? The nVidia cards have had this in hardware for years and every Windows driver lets you define that and more. I really think my display settings are too bright with too little contrast. Yes, I ran the calibration tool several times, but I never end up in a place I like and never with a darker overall look. Is there no 3rd party utility or anything that lets me change my display settings in OS X?