For those of you who want to extra protection on your Facebook account you can now configure this in the Account Settings section of your Facebook account. It allows you to keep track of locations and computers your Facebook account is being accessed from.
Once you turn on Login Notifications, the next time you log into your Facebook account you will be asked to add this computer to the list of trusted computers to login from.
So, now when you get an email notification that a new computer has been added and you know you did not add this computer yourself you can then login to Facebook and quickly change your password to prevent unauthorized access. Remember to use a complex password as an account with a weak password is easily broken into.