I knew that the Macs are the most secure operating systems around, but what surprised me is that someone took the trouble of writing a comprehensive 29 page PDF report about it.
“The research report looks at significant OS X threats including local, remote and kernel vulnerabilities and discusses overall system design weaknesses that contribute to insecurities on the Mac platform. The document also reviews the current state of malicious code, discussing the presence of several viruses and worms and the existence of three known rootkits for OS X.”