Many consumers are aware that their credit history can have a big impact on their lives, and the effects reach beyond the home mortgage, the auto loan, and the credit card. Credit scores have long been used by insurance companies in determining the premiums you pay. Hospitals are starting to look at credit histories before providing some types of care.

And now the credit scoring mystery gets a little stranger. The FTC is suing CompuCredit, company that provides credit cards to people with poor credit. The FTC is alleging that the company uses unfair practices in its proprietary system of credit scoring for its customers.

For CompuCredit, it doesn't just matter how long you've had an account, whether you've made your payments on time, or whether you've exceeded your credit limit. They also include factors in their scoring system based on what you're buying with your credit card. And they're cutting off customers who use their credit cards at massage parlors, bars, billiard halls, and marriage counselors.

Today in the mail, I received a new credit card from Discover. But the question is why. I didn't open a new account. My card hadn't expired. I didn't get a new account number. I hadn't lost the card. I didn't request a second card.

There was no documentation with the card other than the standard "here's your card" notice and the sticker on the front of the card saying it must be activated by calling from your home phone. Except I already have a card with the exact same numbers on the front and the back that's already activated. No activation needed for this card I received today... the card number is already up and running.

Each time a credit card company sends out a credit card, isn't there a certain amount of risk that goes along with it? The envelope could get lost and the card could end up in the wrong hands. The card could be stolen by someone who's a part of the mailing process. At the very least, someone could get the numbers off the card and try to use them online.

Consumers have rights when it comes to fraudulent credit card charges or charges for products and services that aren't what they paid for. The key to successfully challenging a charge is in knowing what to say and who to tell. That sounds elementary, right? Except Consumer Reports is saying that many consumers don't know their rights or how to enforce them.

Small dollar amounts are easy to dispute and resolve, as it's estimated that it costs a credit card company $25 for each charge it must investigate. This means they're likely to give refunds for small amounts without much work. It would cost more to investigate than to just give you your money. The credit card company also has to weigh the risk that you will close your account if your matter isn't resolved. They lose money when you do that.

Here are a few key points about your credit card: Report suspicions of credit card immediately to stop the harm. Most billing problems need to be disputed in writing, and many credit card companies don't recognize e-mail as "in writing." The credit card company must receive your letter within 60 days from the statement date, so don't wait. Include with your letter all copies of supporting documentation to help prove your claim.

One key to getting your credit card company, bank, or other creditor to work with you when your financial situation is precarious is by making sure they're listening. Make no mistake, credit card companies want your business. Heck, they want business so badly, they're willing to give a credit card to just about any adult with a pulse. But of course, they want to be paid back.

So if you're trying to negotiate with a lender, the first step is to make sure they know that you want to pay them back. (Don't make silly references to bankruptcy and such. That's just a threat and doesn't get you anywhere.) If you're asking for a break on your interest rate or some extra time to pay, make it clear that you plan to pay everything you owe, but you need some temporary help. And once the credit card company or bank gives you that help, make good on your promises and pay as agreed.

Here's an example of how not to get your lender to negotiate. Be obnoxious, annoying, and belligerent. Believe me, the old adage of attracting more flies with honey is true. Be nice to the customer service representative and give her or him a reason to want to help you.

Tracy L. Coenen, CPA, MBA, CFE performs fraud examinations and financial investigations for her company Sequence Inc. Forensic Accounting, and is the author of Essentials of Corporate Fraud.

Most credit cards with variable rates have their rates tied to the prime interest rate. That rate has been going down, but consumers are still seeing their credit card interest rates rising. How can that be?

For consumers with good credit, their credit card rates will usually fall as the prime interest rate falls. But those consumers whose credit is suffering will not see the same benefit. Particularly if they are behind on their debts or doing other things that negatively impact their credit scores, they will likely see an increase in credit card rates.

So if you've got a credit score of 700 or above, expect to see your interest rates on your credit cards go down. If your score is lower or you've been experiencing debt troubles, watch your rates carefully. They're likely to be on the rise, which could put you even deeper into trouble. You typically have the right to refuse the rate increase, but you'll have to pay off the account and close it. Play the credit card game wisely.

Tracy L. Coenen, CPA, MBA, CFE performs fraud examinations and financial investigations for her company Sequence Inc. Forensic Accounting, and is the author of Essentials of Corporate Fraud.

Have you heard of the "smart card"? It's a credit card that's enabled with a "smart chip" which utilizes RFID technology to transmit your credit card information to a checkout terminal. The cards are supposed to save time and improve security.

It sounds cool, doesn't it? It is... except it now means that someone can steal your credit card information without ever even touching that card. If they get close enough to you with a device created to steal the information transmitted by the smart chip, your identity and information can be compromised.

Credit card companies say that their cards with the chips are secure and consumers shouldn't be worried. I'm not so sure, and I think I'll take a pass on the chip-enabled cards for now. I really don't need identity thieves to have one more way to steal my credit.

Tracy L. Coenen, CPA, MBA, CFE performs fraud examinations and financial investigations for her company Sequence Inc. Forensic Accounting, and is the author of Essentials of Corporate Fraud.

Nancy Trejos, a personal finance columnist for the Washington Post had her identity stolen and her debit card and bank account compromised. She was lucky. Her bank called her while someone was trying to buy over $800 of merchandise with her debit card number.

The writer found herself in an unusual position. She had given up her credit card in favor of a debit card, hoping to become debt-free by avoiding credit cards. Trejos used her debit card a lot, and each time she used it, she was putting her bank account at risk. Each time we use our credit card, we're putting our accounts at risk as well. It's just the nature of the beast. Use a card, and the number is exposed to someone.

Trejos quickly found out that the thief had more than just her debit card number. She also had lots of personal information and the security code from the back of the debit card. How did that happen?

While she pondered her situation, she set herself up with a "fraud alert" at one of the credit bureaus, filed a complaint with the FTC, and reported the situation to the police. It would now be harder for Trejos to get credit, as each credit issuer would have to verify her identity before approving a new account, but it's a hassle worth dealing with if your identity has been compromised.

Last week at The Consumerist, a Chase customer service representative gave some insight into his job and how the bank views customers. I found out that I'm a bad customer for Chase, and I like it that way. Here's why I'm a bad customer....

Apparently only about 5% of credit card customers are considered the "best." You get to be a best customer if you borrow lots of money from the bank for homes and cars, or if you have a high credit card balance and you're paying them a lot of interest.

You get to be a "valuable" customer of Chase if you pay your credit card bill on time. Basically, you cause the bank no trouble, so they don't mind keeping you. But you do have to still pay the bank some sort of interest charges.

And then there are the "non-profit" customers of Chase. They pay their bill in full every month, so no interest charges are generated. A small fee is earned by the bank each time you use your credit card, but the vast majority of the transaction fees are kept by Visa and Mastercard, so essentially Chase makes no money on your account. The non-profit customer always pays the bill on time, so there's never a late fee and they don't go over their credit limit, so no fees there either.

We've talked a lot at WalletPop about the exorbitant fees charged by credit cards, and the restrictive and confusing agreements that come with your credit cards. Well it seems that the credit card companies are taking it even further by becoming more aggressive with interest rate hikes.

More people defaulting on their accounts means the banks have to make up that money somehow, and they've decided to do it with higher penalty interest rates. A penalty interest rate is generally charged when you are in some sort of default under your credit card agreement, most often by paying late.

Credit card companies are hiking rates as high as 30%, even if you only pay one day late. Consumer advocates say this is unfair and should be illegal. Others say that people should either carefully follow the terms of their credit card agreements (pay on time) or face the consequences.