This just isn't true.
It's the same as the IE vs Firefox issue. It's FALSE.
People are under the illusion that Mac OS X is more secure, because there are currently no viruses in the wild for it. Windows is constantly under attack, because it holds the vast majority of the market - but that doesn't automatically mean it is insecure.
Think of it like this. A big house holding lots of artwork has security cameras, security laser beams to track trespassers, floor sensors, you name it, the whole works. [This is Windows]. There are on average 10 attacks or attempts to get into the building every day by theieves, and this week one attack was successful. Because the "Administrator" has however taken time to properly secure the building, most of those attacks are unsuccessful. I actually have a video documenting security of Windows, such as policies, zone permissions and user control, on my Youtube. Ask if you want a link.
Now take a small house in the country holding nothing but a small painting. There is no civilisation for miles around, and the building only has a small wire fence and a single frontal security camera. This is the Mac. So far this year there have been two attacks; one was partially successful and one failed.
See what I mean? The small house (Mac) is attacked less, whereas the big house with more goods is attacked more. This doesn't automatically mean one is more or less secure than the other.
BMF, you know I am a Mac and a Win user, so you know I'm not biased. But I am stating this as a fact right now, the reason Macs are not targetted is because of their obscurity, and the fact that they are not aimed at corporations. Who wants to bother attacking a machine in someone's home that holds 6-8% of the market, when they can attempt to attack a corporation full of Windows machines?
See what I'm getting at? The Mac firewall is a good thing. Of course you need to close off ports, it's essential. My Windows machine is riddled with permissions and such allowing exactly what I want to do, to be done, and nothing else. I don't use AV, or Firewall (except Windows Firewall), etc, and I have NEVER had a virus attack. Ever.
People need to STOP making false assumptions and learn.