A student in Germany stores music SID files (SID is the music format for the C64) on RFID tags and plays them back when approaching with a RFID reader.
When such a music-loaded tag is put near to the reader, the music is played on a connected stereo. He uses a RFID reader, which connects to a PC through USB. The C program for this hack is available for free download.
More details and videos. Via Slashdot.
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