Credit Bureaus. Equifax, one of the "big three" credit bureaus, with headquarters in Atlanta, Georgia. This site explains what the company offers, and includes some credit and fraud FAQs, a useful glossary of credit terms, and online ordering for your credit profile.
Equifax
Experian, second of the "big three" credit bureaus (formerly TRW), with headquarters in Layton, Utah. In addition to some basic company information, this site allows you to order a copy of your credit report online, has some basic FAQs, but not much else of consumer interest.
Experian
Trans Union, third of the "big three" credit bureaus, with headquarters in Springfield, Pennsylvania. This site provides basic company background, and a lot of helpful consumer information, including a good explanation of your credit report, fraud victim information, FAQs, and online credit report ordering. An excellent resource.
Trans Union