Thanks to all for the recommendations.
Wayne, not to get into a real discussion here because I am in no way a computer expert (obviously), but I have read more than once that there are currently Trojan Horses out there written specifically for the Mac. A recent posting on this : http://www.chaosmanorreviews.com/oa/2008/20080915_mail.php
Macs are clearly safeer than PC's but I do remember reading that while it may be harder to write malicious software for the Mac (or Unix), it is not at all impossible and that the real reason more viruses do not exist is that the installed base of Windows users is so much greater than any other. I guess the hacker types like to hurt as many people as they can for their efforts.
You said you didn't want to get into a discussion, so sorry. I'm home, bleary eyed from working on pictures, and somewhat bored, so as a diversion I sort of got long winded here.
There certainly can be trojan horses created for any OS. The famous trojan horse of greek mythology was an innocent appearing "gift" provided to the city of Troy. The inhabitants of the city willingly opened its gates and brought the horse in ... with dire consequences.
This is a very appropriate name for a computer trojan horse. A seemingly innocent program ( in the case from your link apparently a video of a celebrity) tempts you the user to run it ... this is indeed the only way it works. You must actually run the program on your computer. On the Mac, not only must you run the program, but to do serious damage, such as erase your hard drive, you must also authorize it with your password.
The only possible protection is what the Mac does already ... require an administrator level password to be entered. There is no software program available that can prevent you the user from running a program that might be malicious.
As far as the myth that more viruses do not exist on the Mac (more meaning none) is because the installed base of users for windows is so much larger ... well that's pretty much just BS, and really isn't very logical.
Are hackers interested in market share? Do they get paid because more people buy their program?
Hackers have plenty of resources when it comes to hacking PC's. All the tools are out there including code and instructions. Windows has a bunch of holes. As a hacker you can download some code, make some changes, and release a new variant of a virus, or several other malicious things. Many of these hacker really aren't top notch ...pretty good, but not superb.
To discover a hole takes more skill, and to discover one that you can exploit takes even more. And beyond that, it requires a deep enough hole in the operating system that the code can execute and replicate without user action or intervention.
I'm not sure why hackers do what they do, but it certainly has more to do with "see how good I am!". I find it pretty hard to believe that some pretty hard core and top notch hackers haven't tried really hard to crack OS X ... for a long time. (OS X was released over seven years ago). But the fact is the design of the system just doesn't have the necessary holes. A few potential holes have been discovered, but a security patch is issued so quickly that hackers don't have time to figure out how to exploit it. It sounds simplistic, but viruses, worms, and malicious key loggers requires the consent of the OS.
This isn't to say that someday, someone may discover some unknown hole to exploit, but to assume the reason there are no viruses is because no one is trying to crack the mac just sort of flies in the face of why hackers do what they do. Suppose it were to happen. What software program can you buy today that would prevent it? None ... because to write a program to protect your computer from a virus, the programmer has to know what the virus is and how it works.