Don't really know how I feel about this. Yes, it will increase convenience, but it will also spawn a new kind of thief - one who puts an NFC receiver in his pocket, brushes up against your pocket with your cell phone in it, and steals your money without having to pickpocket you. A wireless robber.
Also, if you lose your phone like I often do, does that mean that people who pick it up can use it as a limitless credit card? Sounds scary.
this is the cool part you will have to put in a pin code for every transaction. so instead of giving the person at starbucks your iphone starbucks card app or a credit card you will have to open the NFC app, wait for it to sync with the POS machine, put in code, wait