http://freelanceswitch.com/rates/
Pretty neat, I have nifty excel sheets for portions of this, so it's cool to see an easy web app for people to know about and use to know if they're charging right or not.
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Thanks!
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Client Analyzer
Also... http://clientanalyser.freelanceswitch.com/
Survey results
http://freelanceswitch.com/general/3700-freelancers-surveyed-the-results...