Security of NFC
Because the transmission range is so short, NFC-enabled transactions are inherently secure.
NFC is a wireless technology that's designed to work over fairly short distances – 10 centimeters or less. The NFC Forum seems to think that this short range makes NFC technology inherently secure. I'm fairly sure that this isn't true.
Because lots of the uses that are anticipated for NFC are things like mobile payments, making sure that NFC is reasonably secure is important, and relying on NFC being inherently secure because of its short range probably isn't a good way to do this. Even over a distance of only 10 centimeters, you still need to encrypt any sensitive data that you're transmitting.