How much of a security vulnerability is created by NFC (Near Field Communications)?

At Black Hat, one thing that came up was security issues related to NFC (near field communications) on mobile devices. This is an area of concern that is new to me. As NFC becomes a standard feature on more devices, how much of a risk does it really pose?

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Story added 3. August 2012, content source with full text you can find at link above.