Here is a prototype of the iPhone using the built in media player that uses physical objects to trigger playback. It is based on Radio Frequency Identification (RFID) that triggers various iPhone interactions when the wireless tag embedded inside the physical objects are within range of the iPhone. Rumors have been circulating that Apple will be adding RFID support to the soon to be released (Summer 2009) iPhone, which would really push this technology into the fast lane.

iPhone RFID: object-based media from timo on Vimeo.