I was given an older windows XP machine I thought it would be a better idea to keep windows and modify the OS to look like Leopard long story short it matchs leopard about 80 percent of the time. Anyone elese attempted this? FOR XP! http://download.cnet.com/FlyakiteOSX/3000-2072_4-10457070.html Makes it like tiger however with modding can look like leopard. Must uninstall SP3 and stay on SP2 check all boxes! FOR VISTA! http://www.brothersoft.com/leopard-transformation-pack-209617.html havent used this so I cant confirm if it looks good!