Check out this great story from InsideOutdoor magazine about the recent technology Sole insoles is working on:
An Out-of-stock solution: the outdoor industry's RFID experiment-
http://www.insideoutdoor.com/documents/IO_Spring10/IO_Spring10/index.html?pageNumber=26
An Out-of-stock solution: the outdoor industry's RFID experiment-
http://www.insideoutdoor.com/documents/IO_Spring10/IO_Spring10/index.html?pageNumber=26