The MIT Media Lab's Cameron Marlow, creator of the excellent Blogdex service, is in the final throes of his PhD, and as part of his project, he's conducting a survey of bloggers:

This is a general social survey of the greater weblog community being conducted at the Massachusetts Institute of Technology. Our goal is to help understand the way that weblogs are affecting the way we communicate with each other. Specifically we are interested in issues of demographics, communication behaviors, experience with weblogs and other technology, and the meaning of various types of social links within the blogosphere.