There is a controversial discussion going on these days concerning Chris Anderson's The Long Tail: Why the Future of Business is Selling Less of More. Make sure to read the original.
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Related and my current read: Peter Morville's Ambient Findability: What We Find Changes Who We Become. Order both books directly with us ...
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I read "The Long Tail" and found it a great book and a "must read"! It is really interesting how many people still oppose Mr Anderson's findings even though facts show that the opportunities which lie in the long tail can be immense.