Blog page rank is very important in every blog, especially the owner. The page rank of the blog would means priority in every search engine there is. My friend's blog has again regain it's page rank after it was stripped by Google. Google establishes page rank based on relativity of posts and frequently searched in SE. The higher the page rank, the better it is. It is because page rank is the basis of advertisers who will pay just to advertise in blogs with higher page rank. After page rank is established, Google can also remove page ranks on blogs with less post and has pornographic content written on the blog. For those blogs with no page rank yet, just continue posting relevant post and it mus be frequent. This is the main point how google establishes page ranks for blogs.