Does anyone can tell me what is the difference between these two figures (google PR vs. Traffic Rank in alexa.com) ? I thought the higher Traffic Rank in Alexa.com should indicate heigher google PR. They are in direct ratio. But I think I am wrong since I notice some sites with lower alexa's traffic rank (around 2 million) have higher google PR (like 2/10) and others with relatively higher alexa traffic rank (like 200K) even no google PR. Which figure is more important for a site's traffic?