I'm looking to implement a reputation-based point system for a QA site. I like Stack Overflow's model, but I was wondering if there's anything else like this out there. I was doing some research on the web, but couldn't find a good compiled list of reputation models. If there's a study of reputation models with pros and cons, that would be super valuable.
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O'Reilly and Associates actually has a blog and a book coming out about this.
As far as 'systems', there are many:
Among many, many others.

double-beep
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George Stocker
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For a related but different approach, check out http://www.klout.com - they're building a web-wide reputation system that looks at social signals from a growing list of sites.

Amy Jo Kim
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You can check other sites like this one (expert-exchange) - but I think SO is the best one I've found on the net.

Dani
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