Different Approaches (Score 1)

The http://www.payscale.com/ service works via the Internet by enabling individual employees to submit their job profile and salary data, which is then compared to others. Because a very large number (millions) of people utilize the service every month, the company claims it is able to use the volume of information statistically to determine accurate real-time salary information. The company generates revenue by selling aggregate data and web services to employers, to aid in determining correct market rates for hiring, benchmarking and budgeting, and by targeted advertising to employees that visit its web site. Salary.com uses purchased data in place of user submitted survey data. While the salary.com approach is arguably a more time tested approach to accurate numbers, it's less diverse as they have no way to accurately gauge the worth of a given skill, the benefit of a shortened commute, or the true value of a given degree. http://www.payscale.com/ wins hands down for my money. check out http://www.payscale.com/research if you don't believe me. Loads of free data to be found.