Kaspersky Anti-Virus has been around on Windows for many years now, but the developer has finally seen fit to release Kaspersky Anti-Virus for Mac.
If you think Macs don't need a virus checker then think again. Although the risk of virus attack is very small compared to Windows, Mac viruses are on the increase and this will continue as Macs become more popular. Kaspersky Anti-Virus for Mac offers quick and thorough scanning options as well as real-time scanning of files download from the net, via email, etc. Note that, as with many anti-virus packages, you need an uninstaller to remove it which comes with this download.
You might experience a bit of a delay while activating the trial version of Kaspersky Anti-Virus but once done, all the features of the full version are available. The interface is simple although the Kaspersky icon appears in your Status Bar rather than Dock, which is a bit confusing at first (although you can change this to the Dock in the preferences). It isn't particularly clear from the main interface however what all the buttons correspond to except the preferences and magnifying glass symbol. You'll have to experiment with trial and error to begin with.
Scanning in Kaspersky Anti-Virus can be rather slow regardless of whether you choose Quick or Full scans, but the database is updated regularly. You can easily select which files and folders you want included in scans and there's a high degree of customization available in Preferences from update frequencies to security level settings.
Kaspersky Anti-Virus for Mac has a nice Mac feel to it and it's highly configurable. Hopefully though, you won't need to resort to it very often.