This article made me mad, "MacDailyNews has an editorial which summarizes reports from various research groups that analyzed the number of computer users affected by viruses. The conclusion was that 16 percent of all computer users are not affected by viruses because they use Macs."
There is an old joke about if builders built building the way programmers write programs the world would be destroyed by the first woodpecker that came a long. I believe the Mac platform is very vulnerable to a virus right now, mainly because Mac users believe that they're so safe. Just because you think you're safe doesn't mean you are!
I believe that someday soon, there will be a lot of unhappy Mac users when some virus writer gets around to writing something (I hope this never does happen, but it always does). Virus writers are pretty predictable, they always go after the biggest targets, and right now that's Microsoft. Once the Mac user base gets large enough, the virus writers will attack them as well.
A good example is of this is Firefox. When it was introduced it was pronounced more secure then IE. Then a few months after its release, people started finding all sorts of big gapping holes in it.
There is no such thing as a perfect security technology, and the best thing that we can do is educate users about how to protect themselves online. If people stopped practicing unsafe computer habits (such as opening email attachment, and giving out there personal) there would be a lot less infected computers in the world.