What is a successful model for getting customers to continuously
create website content for a company?

Essencially I am looking for basic principles of human behavior online.
What are the driving forces that make people spend time to develop
someone else's website?
What companies have most successfully and consistently gotton
customers or community members to create content that overall benefits
the company.
example-tripadvisor.com- i would look for a list of 10 or so comparable companies.
What are the best practices from this group- what do they all do?
What are some resources for learning more about the subject of
behavior modification and online business?

Please avoid answers like- they have blogs or chat groups. I am looking for
something deeper reasons why people blog on a particular site and not
on another- especially in the context of for profit companies-

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Clarification of Question by zarius-ga on 28 Sep 2005 11:24 PDT

I need a rather quick turn around time- 
please have answered by no later than Monday Oct 3rd 05.

Thank you