Poll for ranking popularity, using http://wiki.lesswrong.com/wiki/List_of_Blogs :
Aretae isn't me, I just suggested his blog a while back. He is, as far as I know, a member of the LessWrong community, although I believe a silent one here.
Also, my blog isn't exactly rationality-oriented.
I'm spending the summer working to update lesswrong, and one of the changes we're looking to implement is changing the "New on Overcoming Bias" part of the sidebar to a more general "New on Rationality Blogs". What blogs would you like to see represented?