The Education Data and Statistics guide lists frequently used popular sources of quantitative summary data and microdata from the United States and the world.
"Published annually, provides NEA higher education members with current information on the entire scope of American higher education. It contains up-to-date information on faculty salaries and benefits, the economic conditions in the states, faculty workload, trends in bargaining, and information on non-faculty professionals on campus."
"Search and explore faculty and staff salary data for more than 4,700 colleges and universities going back more than a decade. Users can look at data over time and categorized by gender by searching for specific institutions or browsing by state, sector, or Carnegie classification." [Coverage dates: 2003-4 to present]
The Society of American Law Teachers (SALT) publishes an annual salary survey in the SALT Equalizer newsletter that provides samples of law school salaries from various regions in the United States.