I have not used an anti-virus in at least 8 years. Nor do I use a "windows" software firewall. That said for the better part of the last 4 years ive only used Linux at home. So you could argue that it was only 4+ years on windows without an antivirus:P

I have been dual-booting Linux and Windows 7 for the last 4 months... primarily because the cellular 3G internet modem i have works significantly better in windows and most of what i do is online. (i dont have highspeed cable or dsl any more). I still do not have a antivirus installed on Windows. From 2003 to 2007 i contracted 1 virus in windows, that I was able to literally disable and remove on my own without any other tools.

My brothers on the other hand... seems like they are getting serious viruses every 6 months... even with Anti-viruses installed. Get regular support calls from them LOL

So i feel quite confident in my own abilities. As you can see ive been a member of this site for 9-10 years now... mostly inactive but ive been "into" computer security for longer than that. And like i said in that time I have had 1 windows virus that was really quite minor. just messed with the tcp/ip stack+settings. I do monitor my connections quite closely though... So i know what applications are accessing the internet and why. Im not just saying that I havent "noticed" a virus

That doesnt mean im not susceptible... theres always a possibility of getting a worm or virus through no fault of my own. You can potentially get a worm just by being connected to the net that takes advantage of a flaw in your OS.