The American consumer advocacy group Consumer Reports recently published a online hazards survey which found:
To this I would add that my guess is that a fair amount of the virus reporting by Mac owners is probably "false positives" - people whose Macs stopped working for some unrelated reason and they blamed it on viruses. Ditto for spyware. I don’t think viruses or spyware aimed at current Macs are still around outside of the labs of anti-virus software companies.
There are some good recommendations linked alongside the report but interestingly it fails to mention one of the best ways to reduce the incidence of viruses and spyware - don’t use Microsoft Outlook and Internet Explorer. It’s not that they are bad in themselves (though I would argue the free alternatives like Eudora and Firefox are better) - it’s that virus and spyware writers tailor their programs to work with the most popular email and web browsing programs out there.
A note about computer literacy - 17% of respondents weren?t using antivirus software and 10% of those with high-speed broadband access–prime targets for hackers–said they didn?t have firewall protection.
Also see two recent reports from the excellent Pew Internet and American Life project:
Spam & Phishing (April)
Spyware (July)