"RFID" entries
Come to ETech; Experiment with Physical Computing and RFIDs
RFID's are associated with credit cards, passports and inventory systems. However, they can also be used to add a proximity interaction to a service like entering a subway via a passkey (Jan Chipchase has several posts describing these interactions around the world). By linking yourself to an RFID tag you can let a device know who you are. If…