Security experts warn that Macs are no longer safe from viruses, worms and Trojans. If you own an Apple computer, better start thinking about anti-virus protection.
At least two major companies, Symantec and Norton, offer such products.
Or you can use a free program, ClamXav. It watches your downloads folder just in case something nasty tries to sneak onto your system. And remember the golden rule: Never open an attachment unless you're expecting something.