A cool application I saw recently in Japan runs on a camera phone. You can walk up to any product, make a photo of the barcode, send it off to the service, and it will come back to you with reviews, comparable products, and, of course, the price at Amazon. This was developed outside of Amazon.com using the Web-services interfaces. The small company that developed this is running a very successful service.
Source: ACM Queue - A Conversation with Werner Vogels: Amazon's CTO explains what's behind its growth from online bookstore to e-commerce juggernaut.
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