Regarding RFID tags to organize collections Our x-ray film printers use the tags in the film magazines to identify the film type. There is an evaluation kit from TI available that lets you read out the unique long integer stored in each tag and you can program several other user available locations. I think if connects to the serial port of a PC. I have "salvaged" several tags and tested them with our ID badge readers, no response. Each tag is about 2" by 4" and looks like a chip and antenna printed on clear mylar carrier. Mike McFadden