Living in a big City (Chicago), I'm pretty concious of where I keep my wallet.  The last thing I wanna do is give the many lowlife thieves that travel the subway an even easier way to pick my pocket.

"MasterCard and American Express have been testing "contactless" versions of their credit cards. The cards need only be held near a special reader for a sale to go through."

"In theory, the transaction could be intercepted without a consumer's knowledge by a technologically savvy thief intent on cloning a card. That's because RFID transmissions themselves are not encrypted."

Check out the whole story at cnn.com.