What’s on the airwaves?

An interesting article describing how hackers can intercept your credit card numbers by electronically sniffing the airwaves near your favorite store. I’ve always wondered if this was possible; your local airport car-rental return seems like it would be a great place to do it. And I knew there was a reason why I refuse to allow Home Depot to use their “line buster” because they are too cheap/too stupid to hire more clerks!