We did a survey program through
City Town Info - Info and Analysis on U.S. Cities, Colleges, and Careers, a website started by a dad from our city, Newton, MA. They gave us $20 for each survey filled out by anyone who mentioned they heard about it from us. The online surveys took about 20 minutes and they queried you about your career - how you got to where you are, what you like about your job, don't like about it, etc. No salary info.
I thought it was a terrific and easy way to raise $. Without putting too much effort into advertising this, we made about $1,700.