http://salaryscout.com/
I was just about to type that one in. Here's the techcrunch coverage- http://www.techcrunch.com/2006/11/20/salaryscout-simple-soci...
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http://salaryscout.com/
I'd question the accuracy of data gathered that way: people inflate how much they make. Allowing people to submit that information anonymously only compounds the problem.