MIT Weblog Survey
I wanted one that said "I whored out my personal data and all I got was this lousy gif" but no such luck. Actually, I like the gifs (you get a choice), and the questions weren't terribly intrusive.
MIT's survey is a "general social survey of the greater weblog community." It's for science, people! The survey doesn't take too long either. Everyone who maintains a weblog (I wish they would say "blog") is invited to spill their guts about their blogging habits (reading and writing-wise). Questions also cover topics such as e-mailing, phone calls, instant and text messaging, and actual people.
Click on the lovely gif if you have a blog and would like to answer the survey.