It's interesting to me that the reaction of Windows-based systems is to rely on other software to prevent malware, while the linux community actually patches the OS to prevent it.
Linux has had some malware crop up in the past, but the community/developers always patch the OS--not develop anti-malware software to run and use up cycles.
Well, remember that Windows is designed to be “all-inclusive,” so the kernel is much more open than your run-of-the-mill generic Nix kernel. Microsoft also only patches once a month. I’m updating my Nix machines quite often, depending on Landscape alerts from my Ubuntu clusters.