It is quite common to adjust digitial photos. In fact the camera has all sorts of processing it does on photos based on your settings. Being able to minipulate and adjust an image digitally is one of the great things about digital photography. Of course, usually the purpose is to make the photos look better.
Um......What else is new?
There's a thread on this at DU. They're ticked that Yahoo airbrushed out his horns and tail.
It looks like the pics were darkened and the color saturation was raised up a bit.