People will have different things to tell you, but as of right now getting an anti-virus program for OS X is entirely unnecessary. I'd say the same is true for Net Barrier. The system has built-in firewall capabilities, as do most routers. The Retriever program is obviously useful for recovering a stolen laptop. How likely your laptop is to be stolen is something you have to gifure out.
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I wouldn't bother with any anti-malware utilities on the Mac. It's just one more thing to have running and using up system resources, and there ARE no Mac viruses or worms in the wild. Besides, anti-malware apps won't even catch a NEW threat if one comes along, until the apps are updated to know about the new threat.
For Mac 'net security I would just do the following:
1. Make sure the Firewall is on (in System Preferences > Security)
2. In Safari's preferences > General, UNcheck "Open safe files after downloading."
3. To avoid trojans (very rare on Mac), download only from trusted sites. If you hear about a cool app, don't just click the link--find it instead on a trusted site like versiontracker.com or macupdate.com, or choose "Mac OS X Software" from the Apple menu.
For laptop PHYSICAL security, a theft-tracking app is tempting. I don't use one, but I do the following to prevent casual breaches and help in case my machine is simply lost:
1. In System Preferences > Security, check "Require password to wake from sleep or screen saver."
2. Under Accounts > Login Options, disable Automatic Login.
3. Choose the Computer Name screensaver--and name my computer with my name plus phone number. That way my computer, when locked down, still shows contact info. It also appears on the top of the login screen.
4. On my user account(s), set a password "hint" which simply displays a "Please return to..." message.
That way honest people who find a lost/stolen machine have an easy way to find me, but they can't actually poke around an invade my privacy.
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