MasterCard, VISA Warn of Processor Breach
http://krebsonsecurity.com/2012/03/mastercard-visa-warn-of-processor-breach/
I read that article yesterday (from a link over at Wilders, IIRC), and it sounds like most of the improper activity resulting from the breach is in the New York City area, and directed more at corporate accounts than individuals.
I phoned my bank last night (which handles Visa) to confirm the problem wasn't likely to effect transactions up this way, and the service rep made the interesting observation that the U.S. is way behind most of the rest of the world in card security. According to him, it's one of the very few countries still using just the swipe-strip ... banks in most others, including Canada, added embedded complex chips to their cards some years back.