As a blogger, having page ranks on our blogs are very important on our online works. Having a higher PR means more work for many advertisers like put their links on blogs or sites with higher PR. Anyway, I must admit that I really can't understand how Google can rank each blog or sites. I know that page ranks depends on many factors like how many hits that your site has, inbound links and more.
I'm not an expert when it comes to SEO but it sure looks interesting to know how SEO really works. I have a tutorial about it but was too lazy to read and experiment on it. Some companies are even hiring seo consultants that can take care of their site's search engine optimization, web marketing and more.