Next week Microsoft will shut down Firefly. For those who don't know, Firefly was responsible in large part for popularizing collaborative filtering, something online retailers such as Amazon and CDNow are now also utilizing. It's a shame to see it go. Microsoft has apparently taken the code and is using it for the soon-to-be-launched Microsoft Passport site which lets people give information once and buy merchandise from vendors without needing to type it in again.
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