When I went full time, I needed to know what to bargain for, so one tool I found helpful was on salary.com:
http://www.salary.com/salary/layouts...ll_display.asp
It's a salary calculator that takes region & experience into account. It was pretty close (+/-) to what my employer offered me.
I'm not sure if they give hourly rates, but you could do the math on the salary they give you, I suppose.