I just completed a survey that's being conducted by the MIT Media Laboratory about weblog authors. (That's the only time I've ever referred to myself as an 'author'.) I did a quick 2 minute check to make sure it wasn't a hoax, and then dove right in. It was quick, and painless; I don't know how much good I did them, but it's the process that counts. Best of all, it contributed to a body of science, which usually makes me happy. Plus, I got a good sticker.
If you feel like contributing, you can always give it a shot yourself. They're not hurting for participants, but every person who completes the survey is a person who contributes to breaking the law of statistical power.