Software protection for Mac OS X

Reading discussion on http://www.networkworld.com/news/2009/041709-first-mac-os-x-botnet.html?page=1 makes me believe that I need to have a software protection.
Can somebody indicate me a software to keep my MBP protected (OS X, Snow Leopard).
Thanks

I understand that is usefull have an A/V installed, even though there is no viruses for Mac. Is that correct?
Depends on your situation. I haven't run, or even installed AV software on any Mac I've owned for the past 11 years. I'll try to explain why.
1) There are a few Mac viruses out there. BUT, they died with OS 9. More specifically, they died with OS X, 10.5.x Leopard when it was no longer possible to run OS 9 as Classic within OS X. Even then, if you managed to pick up one of those few, and not even very harmful viruses, they would only affect OS 9 running within the Classic environment since they can't run in OS X.
No one has successfully created a virus which can run in OS X in the over 10 years it's been around.
2) Doesn't mean someone won't eventually succeed. Until then though, you're wasting a lot of CPU time guarding against nothing. And when a virus does come out that works in OS X, your AV software will still be useless against the initial attack since all AV software works by finding known threats. It can't protect against something it's never seen before.
Heuristics are no help, either. AV software uses this technique to help identify new, previously unknown threats by recognizing similarities to known malware. Since there are no viruses for OS X, there's also nothing for heuristics to compare against, so it will still miss the first viruses.
3) Your biggest defense is between your ears. Don't download illegal software. It's intentionally loaded with malware. If an admin box pops up asking you to confirm something when you haven't done anything to prompt such a request in the first place, DENY.
It kind of takes the fun out of surfing the web, but infected and purposely malicious sites have killed casual use of the web. Even known, "safe" sites aren't necessarily safe. Look at Google Images. You can bet they aren't happy about all of those infected images that prompt the automatic Javascript download of the current Trojan apps pretending to be Mac AV software. Someone managed to hack into and infect a large part of their servers.
4) Where you may not have a choice is in a business. Most require AV software on each and every station. Being on a Mac doesn't give you special dispensation. While there are no viruses for the Mac, you could easily forward a Windows virus attached to an email you received to someone else running Windows. That user and your IT department would not be happy with you.
So in my personal opinion, AV software is a complete waste of disk space and system resources at this time. Especially for a Mac in your own home. Just watch out for the few known Trojans.

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