the first mac OSX trojan was discoved, there is no report on if it has infiltrated anyones computer but it seems like it is out there. Basically it sounds like the code for the virus is in the ID3 tags of .mp3s, .jpg's, etc and if these are double clicked on they launch the virus whcih can delete files and send itself, as of now i havent tried it to see if it actually does all that :p