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. Related and my current read - compare my post in preparation: Peter Morville, Ambient Findability - What We Find Changes Who We Become.
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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.