People say only Porsche enthusiasts can tell difference between 08 and older Cayennes. Well I just switched from 04 Cayenne S which I loved to new 2008 model and I have to disagree. Front of new S has been redesigned to give slicker lines, more aggressive looking grilles and there is an unknown something but when my wife and kids saw it (in same color) they all said it looked much sportier. The extra power in the new S (extra 45hp) makes a big difference. If you want you can drive in sports mode (change gears at 6k) and acceleration and smoothness of change is noticable. New nav system is much better than the old. What can I say, I think new model is big upgrade on old and worth looking at.
Extra power, sportier front, better nav system, oh and I personally love park assist.
For a state of the art company, Bluetooth would have been nice.