Credit Cards Mixed Blessing

FILE - In this July 27, 2007 file photo, signs for American Express, Master Card and Visa credit cards are shown on a New York store's door. The rules your credit card company operates by will start getting much clearer on Thursday, Aug. 20, 2009. But just because you'll know what they're up to doesn't mean you're going to like what you learn. (AP Photo/Mark Lennihan, File)
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