With all of the security hacks, it is more than safe for us to all assume that our data is out on the web for sale. As such, many security professionals recommend freezing your credit. I have had mine frozen for 10 plus years. All this means is that no one, including yourself will be able to run a credit check and open a loan, etc. When you do need to run a credit check, you will have to pay a one time fee of $10 to temporarily unlock your credit. There is also a one time fee of $10 (per credit bureau) to freeze your credit. This is much cheaper and much more effective than paying a monthly fee to monitor your credit.
(Equifax may be waiving this fee due to the recent hack).
Brian Krebs has a great article on the specifics and details if you have questions!