Salary Survey Websites
WSJ's Salary Data and Hiring Trends - Provides links to salary information from current sources for MBA careers, including nonprofits. Choose a job and inspect "more salary tables" for links to current surveys.
JobStar Central - Choose "Salary Info"
Wageweb
Bureau of Labor Statistics - Choose "Publications and Research Papers" and the "Occupational Outlook Handbook"
Salary Wizard
Salary Expert
Salary.com
Nonprofit Salary Survey