Mac OS X malware is currently very thin on the ground, but a couple of in-the-wild Trojans have recently appeared. How long can it be before an OS X virus is released? Perhaps it's time to install some security software just in case and PC Tools' iAntiVirus is a good place to start.
Designed with ease of use in mind, it boasts a straightforward interface and is easy to install. On opening the app, you can scan your Mac for malware that's already present.
This scan is not exactly packed with options, offering a Quick Scan, which only looks at areas where malware is most likely to lurk, Normal Scan for a system-wide check, and a Custom Scan that lets you look at specific files and folders. Configurability is traded for simplicity.
The application runs in the background, checking for new infections on the fly, against a database of known threats that's regularly and automatically updated. It happily detected a Trojan we threw its way and quarantined the file inspection.
The free version for home and home office users is unrestricted, with the paid-for upgrade path adding telephone support only. Unfortunately, it's Intel and Leopard-only, so PPC users and those still using an older version of OS X are out of luck.
As it's dedicated to stopping Mac malware, iAntiVirus doesn't include Windows viruses in its database. This will come as both a blessing and a curse. Positively, it facilitates a very small footprint, occupying a mere 11.2MB of hard-drive space and using minimal system resources while running in the background, but it also means a Mac user could still pass a virus to Windows users via an infected file.
Consequently, iAntiVirus is not particularly recommended for users who share a lot of material with PCs, but for your home Mac, it's an excellent security solution.