Hey all, we've launched a big update to postrank.com, looking for feedback! The big new feature is ranking blogs by engagement (week over week). A couple of examples:
My Ruby reading list: http://postrank.com/user/igrigorik/topic/ruby
Rails: http://postrank.com/user/igrigorik/topic/rails
Anyone can create list, or just search for global topics. Feedback and ideas much appreciated. ;)