I just recently got my Mac Pro, upgraded from a G5 and the speed is just amazing. At the moment, I do not have the beast apps that push my 8 core to the limit, such as CS5, except that's the main one I heard of, hopefully FCP 8 will (that's another topic). Plus I have been out of the game for a bit so I have not really looked around. I have some apps coming, such as CS5, but what others really take advantage of the power? No matter how odd they may be.