If you pay off your credit card bill each time, you might not need to read the article. Otherwise, it's a good read.
The author debunks 5 promises from credit card company:
Promise #1: “As low as 9.99% APR!”
Promise #2: “Up to 5% cash back!”
Promise #3: “0% APR on balance transfers for 12 months!”
Promise #4: Your card has a credit limit of $3000.
Promise #5: “Any time for any reason”