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UPCs, those bar codes featured on packaged goods, are turning into an unlikely new media opportunity as Coca-Cola, PepsiCo, Kraft, Campbell Soup, Procter & Gamble and others link with mobile technology providers.

Proponents of the technology say it provides a new stream of consumer communication, but critics say it will be of limited interest. At the moment, many major packaged-goods marketers are dipping their toes in the water with low-key pilot programs.

Perhaps the highest profile use of the technology right now is in the Cola Wars.

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