MyDD just finished a study on blog traffic during the Hurricane and, interestingly, when looking at the 100 most trafficked blogs and netroots sites, the liberal sites had traffic increases of 34% while the conservatives had traffic increases of only 8%.
One factoid I particularly liked:
All six of these blogs (Dailykos, Talking Points Memo, Raw Story, Eschaton, Crooks and Liars and Americablog) now have more traffic than Instapundit, which remains the highest trafficked conservative blog