We depend on Anti-virus (particularly in the Windows World) to be our savior from all the little nasties out in the web based world. Well, those who have poor browsing practices do anyway, and normally I’d say you’re a fool if you don’t depend on such software to some extent.
This article, however, shows that even the protection we depend on, can sometimes be used against us. So use good browsing practices, and pay attention to what you click, the sites you visit, and the emails you get. Smarts can’t be substituted.