Periodically check your credit report

Get a copy of your credit report from each of the three major credit bureaus every year. (Federal law gives you the right to one free credit report from the three credit bureaus: Equifax, Experian, and TransUnion — http://www.ftc.gov/bcp/conline/pubs/credit/freereports.htm.) Check the reports to make sure everything is accurate. Consider staggering the requests and obtain one report every four months. That way, you can watch for signs of identity theft (i.e. inquiries that were not generated by you, accounts you didn't open).

[SANS Institute]