While the potential of RFID (radio frequency identification) remains enormous, food retailers -- Wal-Mart Stores notwithstanding -- are generally taking a cautious approach to the much-ballyhooed technology. That's probably not a bad idea, considering the technical hurdles that still need to be overcome to make RFID a cost-effective tool for retailers and manufacturers. Nonetheless, retailers are interested in learning more about RFID. No doubt, many will attend this week's EPCglobal U.S. ...

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