nature girl said:
this is awesome! i LOVE this!!
so i guess i don't have to worry about spyware or anything of that sort?
before i sold my pc laptop, i spent hours cleaning the virus and spyware on it... i'm glad i got a mac!!
See thinking like that is what scares me. Mac users have been lulled into a false sense of protection because of the lack of malware on OS X. Just because it doesn't exist doesn't mean it can't happen.
Not to get morose or anything but it would be like saying 3 weeks before 9|11 that because we haven't been attacked lately we are secure.
The fact of the matter is a virus's primary means of propagation is through user intervention. Someone clicks on a bad link. Someone opens up an infected file from an e-mail who's title is: Open me now! Someone downloads pirated software off the net and it screws up their computer. Oops that already happened on OS X didn't it?

But in that case it was a trojan not a virus. If a user doesnt remain vigilant when dealing with his/her security they are opening themselves up to a potential attack someday.
A virus is simply a program that runs like any other program. Until an OS becomes smart enough to say "HEY! That's a virus! It's trying to do bad things to me! *lays the slapdown* then viruses on the Mac will be a possibility and AFAIK this isn't the case yet.
I'm not so much worried about viruses on the Mac. Viruses can be nasty to be sure.
No its worms where you get into a hell like situation. Worms act similar to a virus but can propagate by themselves without any user intervention and can infect another system on the fly. We all remember the MS blaster worm right? No user intervention was needed there. Simply connect your computer on the net, and sit back and wait for infection. Currently on an unpatched Windows 2K/XP system that is directly connected to the net either via broadband or standard dial-up it takes less the 20 minutes for a system to be infected. What's really funny is that the average time to download the current latest and greatest patches is over 20 minutes.

So there is no way, other then to put in place a firewall, to secure your system before you are infected. Gotta love it.

Sorry got off on a Windows rant for a second.
My point being is that to date, AFAIK there have been no holes setup in a fashion that would allow a worm to propagate. (There was an issue with Safari but that required the user to actually go to a site.) As long as OS X doesn't start leaking holes of the likes that allowed MS Blaster to occur OS X users should be fin,e but users, be they windows or Mac, should ALWAYS remain vigilant. Watch your e-mail and delete suspicious crap, setup a firewall, make sure your browser is secure, (Which basically means you are fine as long as you aren't using Internet Imploder.) and stay on the latest patches.
Honestly a good portion of the reason OS X doesn't have any viruses probably is because of their market share numbers. Honestly why would a virus writer go out and spend money on a Mac when in all likelihood they already have the hardware under their desk to test X86 viruses. Apple's market share, closed hardware platform, BSD base, and brand loyalty all play a part in their inherent protection but again that fire blanket they have can rip if someone tried hard enough.