The "Macs don't get viruses" argument has been pretty tired for a while now, and with the recent Koobface and Boonana malware threats Sophos, ESET, and Trend Micro have all released Mac-friendly security products to thwart viruses and malware aimed at the Mac platform.
The Sophos Anti-Virus for Mac Home Edition is a free antivirus that is designed to protect against viruses, malware, and other threats; "even those designed for Windows." ESET Cybersecurity is a spinoff of their NOD32 Antivirus that requires a yearly subscription but also includes educational tools for staying safe online. Trend Micro's Worry-Free Business Security 7 now offers an advanced version of their Windows product that is Mac compatible.
Hopefully these products hitting the market can be a step towards getting the uneducated to stop using the "Macs don't get viruses" line as a reason to buy one...
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