Job Search Intelligence -- a salary research tool, with a large set of questions to provide compensation data (currently offering information on 480 occupations, within 560 geographic regions). Sources include the U.S. Department of Labor, U.S. Bureau of Labor Statistics, U.S. Census Bureau, U.S. Equal Employment Opportunity Commission, U.S. Bureau of Economic Analysis, and previous job-seekers. No cost to job-seekers.
PayScale.com -- a salary assessment site that matches job-seekers job profiles with expected compensation through comparisons to compensation packages of job-seekers with similar skills and experiences -- rather than through comparing simple job titles or zip code comparisons. Basic report is free, while more detailed reports are fee-based.
Salary.com -- if you're looking for help in determining the value of a job offer or what you are worth on the job market, this site compiles a collection of salary reports on many occupations. Free.
GlassDoor.com -- This on-line tool provides salary information for a wide variety of positions by location, industry, company. Site also includes employer profiles, insider information, company news and advice about specific jobs.