you got an oyster card??? thought so (if your from London) anyway the way your oyster card works is RFID, its a chip that hold information (say how much money u have on it) and then changes that information every time you use it, NFC builds on that.
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Near field communication (NFC) is a set of standards for smartphones and similar devices to establish radio communication with each other by touching them together or bringing them into close proximity, usually no more than a few centimetres. Present and anticipated applications include contactless transactions, data exchange, and simplified setup of more complex communications such as Wi-Fi.[1] Communication is also possible between an NFC device and an unpowered NFC chip, called a "tag". " Wikipedia
here is a small video just to show u the concept.
this could be a really interesting way to send data like pictures videos and documents with ease.
currently orange and hsbc r testing this service in the UK.
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