The U.S. Department of Labor's Bureau of Labor Statistics has created an Occupational Employment and Wage Estimates webpage that contains occupational employment statistics for the years 1999-2004. Internet Legal Research Weekly describes the site:
Here's another gem from the Department of Labor site. And it's very simple in what it offers: it's just employment and wage estimates for 1999-2004, broken down by occupational group. It's a good place to find the mean andmedian hourly wage estimates for nearly every job imaginable, both on the state and federal levels.