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Originally Posted by tweetiepooh
AV for Linux try ClamAV. There are others too.
You do really want AV even on Linux. It is a less popular target but it's still a target and what if your Linux gets used as some form of vector to get to Windows boxes.
One issue is that some consumer Linux's are not as locked down as they could be. They are using Linux as a cheap platform that will be less resource intensive than XP or Vista. They are not primarily being used for their security.
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In my experience the most common attack on a linux box is looking for week logins to ssh. If you have sshd exposed to the internet on its standard port you will get a new attack every day or two. There are various ways to stop this such as denyhosts, setting to a non standard port, disallowing password authentication or just sitting behind a NAT router/firewall.