It may just be my imagination, but ML seems to have a bit more saturated colors, contrast and just a little more red in there on my mid 2010 iMac. Is the color profile changed or something? Maybe the profile is best suited for the newest iMac and not for the older ones. I would guess the new iMacs have different panels? Coming from Snow Leopard btw. Edit: Also I have to say it looks better than on SL, but I'm worried the increase in contrast and saturation may look wrong in comparison to print and other displays.