I am quite new to blogging and noticed a few sites like this: http://www.mybloglog.com/buzz/community/lolroulette http://www.blogcatalog.com/blogs/lol-roulette.html Technically, what are these places called? Are they directories, blog search engines, feed burners, ect? I really like how they automatically update my newest posts and creates a link back to them, especially the do-follow link backs. Where can I find more sites like this? Where are the top ones? Thanks