The only serious threat to OS X so far has been the "opener script", which is a rootkit apparently related in function to this Sony trojan. Since the advent of the "autostart virus" back in '96 or '97, Mac users habitually turn off autoplay in their CD/DVD prefs, but this is no protection against a downloaded rootkit. My guess is that the black hats will quickly copy this Sony trojan and modify it, then add it into illegal copies of useful apps, which will then be placed on warez sites, warez newsgroups and P2P services like BitTorrent. One of the Jaguar security updates supposedly took care of the rootkit problem, but I am unaware of any similar security update on the Windows side.