if you are looking for the free credit report usa national site, check out this site
http://free-credit-score-national.com/
Here you can check your 3-in-1 Report from all three credit reporting agencies and your credit score rating.
There are two sites that offer completely free credit scores, and you don't have to sign up for any services. These are www.quizzle.com and www.creditkarma.com. I believe that credit karma offers a score based on information in your TransUnion credit history and quizzle offers a score based on information from your Experian credit history.
I have used these sites myself and they are legitimate.
If you go to http://www.annualcreditreport.com you can get all 3 agencies (Experian, TransUnion, and Equifax).