Apple’s Snow Leopard Is Less Secure Than Windows, But Safer | Gadget Lab |

Apple users have less protection from viruses and malicious software than Windows users do. But they’re still safer, security experts agree, because so few malware programs target the Mac.
Those hundreds of pieces of malware are small compared to the 1.8 million total pieces of malware discovered last year, but it would be unfair to compare these numbers directly, Viega said. He noted that because so few Mac users are running anti-virus software, there’s far less need for malicious coders to create hundreds of different variants of the same attack, as they do for Windows.

exactly my point...people just don't make enough malware for Macs, which *does not* imply Macs are safer!