Some great links on Mac Security, firewalls, anti-virus and apps to watch the other apps.
Mac Security Basics – A great little article on how to set up your Mac security.
Little Snitch – A review of the app that snitches when the other apps misbehave
Safari Java Plugin – how to disable it
Block Popups in Safari 6
Analyze Suspicious Files and URLs
Encrypt External Drives in OSX Mountain Lion