MIT is doing an online survey of bloggers. Click the button to participate. It takes about 5 minutes.
You don't have to writing a political blog, they want to know about all kinds of bloggers.
You can also see how you compare to the rest of the study by checking the Survey Results. Final results will be posted here sometime in early July.
Interestingly they have had 16,000 male and 28,000 female respondents