How To Prevent Malware on Lion & Snow Leopard Macs
Lock down your Mac: Step 1
Go to the Security settings screen and unlock it by clicking on the lock in the bottom left corner. Match the security settings in the screenshot above. Note: disabling location services and remote controls is for people who want to be excruiciatingly careful. To my knowledge there haven't been any exploits of either feature deployed on a large scale. But remember, just because you're paranoid doesn't mean they aren't tracking you through location services.