This article on Google’s newsletter for librarians gives a well explanation on how google collects and ranks articles. You may think that you know PageRank well. But I promise you will find something new in this article. The best part I like is this exercise, for more details you should refer to the article:

Now tape those documents on a wall, step back a few feet, and squint your eyes. If you didn’t know what the rest of a page said, and could only judge by the colored words, which document do you think would be most relevant? Is there anything that would make a document look more relevant to you?

This shows you how important a good title is. Take a look at your page source. What’s in your title and h1 element. Are they relevent to your article?

Most websites put a static site name in the title of every page. Just think about how many times, you should modify the description area when you tag a page to online bookmarks. This shortage in page design not only annoys taggers, but also shows less importance to Google.

So I have something to do with my site now. Hehe!