Check out this survey about the impact of book blogs over at Literary License. It's very short. Here's her post:
"Recently, there's been quite a bit of online discussion about the impact (or the lack thereof) of lit blogs. To get a better sense of the influence of lit blogs on book-related purchasing decisions, I've created a (very brief) survey. Please take the survey, and forward the link on to your lit-blog-reading friends. I'll post a summary of the results on Friday, February 13th."