The Mac is designed with built-in technologies that provide protection against malicious software and security threats right out of the box. However, since no system can be 100 percent immune from every threat, running antivirus software may offer additional protection.
Windows Vista is full of "protection", but I use antivirus on that as well. I love MacOS X, and I'm sure it's more secure, but there will be viruses and other malware on MacOS sooner or later.
By the way, isn't it ironic that Apple is still offering ClamXav for download on their own website?
The latest version can be found here. It renders
"Card readers? We don't need no stinking card readers." -- Peter da Silva (at the National Academy of Sciencies, 1965, in a particularly vivid fantasy)