Well I did it I upgraded to Leopard this evening. Seems pretty stable, though it has only been running a few hours. I really like spaces; I know Linux has been having something similar for a while. I also like the new Finder with cover flow, but I do not know if I will get much use out of it. I will set time machine up before work tomorrow, so I will see how that goes. Bottom line opinion, nothing that will really set your world on fire here, but OS X continues to evolve in the right direction.