NFC(Near Field Communication) will enable our phones to talk with things such as gas pumps, vending machines and cash registers, basically anything you might want to transfer money to.
NFC could also allow our phones to interact in new ways with old objects, like say, a door lock. You would hold your phone close to the lock while turning the knob. An electromechanical power circuit converts that turning force into enough energy for about about 300 miliseconds, or about 1/3 of a second processing time. A low power microcontroller within the lock accesses a connected NFC chip containing the locked/unlocked status of the lock. This NFC chip would receive it's power over the air through the short range RF interface with the phone's corresponding NFC device, relaying the unlock code to the lock's microcontroller. The balance of the doorknob turning force would then be used to mechanically move the bolt, opening the door.