More than one month ago I gave a presentation about the NFC credit cards privacy at No cON Name (NcN), a well known Spanish security conference. It's not a new subject and, also, some researchers presented talks about it in other conferences during this year, but, until that moment, there were no proofs of concept with Spanish credit cards (at least public ones). You can take a look at the presentation here (Spanish).
As I have mentioned in some posts about this subject, NFC payments are a normal part of life in some Asiatic countries, like Japan. However, this technology has arrived this year to Spain and other European countries, supported by banks, mostly. The result is that a person could have an NFC credit card in his wallet without even knowing it. It wouldn't be a problem if data were correctly protected, but we can't assume anything in the security world and this is another proof of that.