Best Online Credit Check

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You can obtain your credit report annually for free at annualcreditreport.com. Getting your score is another story. That will cost you under $10 at FICO.com. Credit scores are not free. (There are some sites that will *guesstimate* your credit score, but it is not something I would swear by)
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You can get your free annual credit report from each of the three credit bureaus at AnnualCreditReport.com. This is the site mandated by the FTC and the only site that doesn’t require you to sign up for monitoring service. Reports are free, scores are not.

You can get your FICO with your Equifax report for about $8. You can also get your FICO for TransUnion and Equifax at MyFico.com. Consumers can no longer get FICO scores for Experian. TransUnion and Experian sites sell you Vantage (different scale/formula). Don’t waste your money. Creditors use FICO. Third party monitoring services use Fakko scores.

CreditKarma.com offers a free score estimator based on your TransUnion credit report. It’s not FICO. But it’s kinda, sorta like FICO, give or take 50 points or so. Close enough if you are just curious about your score.
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BD

While I haven’t seen anyplace online where you can check your actual score for free you can get your free annual credit report online to give you a pretty good estimate of where you lie within the credit realm. I did it yesterday at http://www.annualcreditreport.com they also give you the option to pay a small fee of about $8.00 to view the score, that’s the cheapest I’ve seen.
Good Luck!
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Experience