Despite adjustments to the credit scoring system to allow for cards with no preset credit limit, there are still circumstances in which using a card with no limit can put a dent your credit score.

Following two years of record foreclosures and high unemployment rates, it may come as no surprise that those scores are drifting downwards, according to a recent study by Fair Isaac Corporation, the originators of FICO scores.

Improving and maintaining a credit score in that range isn't rocket science, but it's important to stay on top of the factors that influence credit scores. To test your credit score savvy, take this quick Credit Score Quiz.

Before shelling out $7.95 or more to get your credit score, consider using one of the many FICO score estimators on the market. The best estimators offer valuable indicators as to what a consumer’s true FICO is.

Are credit cards for people with bad credit worth the high costs? According to one study, if your aim is to improve your credit score, yes, they are. The study was performed by the credit bureau TransUnion, which was commissioned by Citizens for Equal Access to Credit to conduct a study of 365,000 subprime cardholders over a two-year period.