well, it's not a virus, but something that has been a friend of the Mac for a long time: Trojan Horse.
it's weird, there was an article posted last week or earlier this month about this being the year of exposing OS X. since we're now on the same playing field as our Linux and Windows friends, this gives hackers and virus writers a familiar platform to work on (x86/Intel).
those of us on the PowerPC, i don't if we have anything to worry about. since the article that was posted about this was about a hacked Powerbook G4. now, i'm not contradicting myself, but it was a pretty big accomplishment, the scientist heard cheers and applauding for this when it happened. hacking a PowerPC Mac is an achievement i guess. now that we're in the x86 arena, i think that puts quite the Mac community in danger.
this may be the beginning, Apple can't hold not having a security division for OS X. Steve you made the call to switch, now start investing in the Mac user safety. OS X is no different from any other UNIX OS, especially on an x86 platform running the soon-to-be-standard EPS instructing on our fellow Intel friends (Dell, HP, Gateway, Alienware, etc.)
so, everyone who bought an x86 Mactel, welcome to thunderdome b****.