I know many people will argue that you don't need virus protection for Mac OS, which is in the main true, but it doesn't hurt to be safe, especially when it's free and unobtrusive! Introducing PC Tools iAntiVirus! It's completely free for home and personal use and is designed to be as simple and easy-to-use as possible. It can run in the background as a Menu Bar icon, or in the Dock (so you can drag files onto it for quick scans). A friend of mine had a couple of (minor) viruses on his MacBook running Tiger. The Apple store staff said that they do know of a few of these annoying little viruses, and they do things like stop application integration (e.g. Address Book with Safari). He bought an Anti-Virus software and removed the problems. I've been looking everywhere for a free Mac antivirus application, and here it is: http://www.iantivirus.com/ Even if you think it's a waste of time with Macs, isn't it nice to be sure? N.B. Requires an Intel-based Mac running 10.5 Leopard. P.S. Forgive me if this has already been posted somewhere or you already know about it. I searched the forums for it and didn't see anything.