Don’t believe the hype that Mac OSX is immune from viruses and malware. If you enjoy browsing the internet, you should absolutely consider installing some kind of virus protection for your Mac. MacOSX has actually been prone to viruses and malware for quite sometime, but to a lesser extent than it’s Windows cousins.
Free OSX Anti Virus, Avira
I found a easy to use, free Mac OSX anti-virus option that has been working for me. It is Avaria. Avaria received the Toms Guide Editors Choice as well as positive ratings elsewhere. I appreciate the way you are not required to log into a web site to manage the application. From what I have seen so far, Avaria does not use a lot of system resources to function properly. I appreciate the minimalist-like settings. Avaria does not include parental controls.
No anti virus program will keep you 100% safe against the bad guys. Be sure that you you have a firewall, be careful on public networks and know what you are installing.
Below are some links to reviews and articles on malware and malware protection.