What is the Long Tail?

What is the Long Tail?
This Term has been making a little stir on the World Wide Web, So after some digging around I found some interesting definitions of the Long Tail Theory. Do you employ a Long Tail Strategy?

What is the long tail?
the Long tail Blog
Wikipedia

LearnDog has been described as a LongTail type of Organisation. http://learndog.typepad.com/learndogpup/2005/11/learndog_gets_l.html

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Phil

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