How do these sites calculate the statistics?
These sites calculate the statistics of a blog or a website by considering the two main factors i.e., Google PageRank and Alexa PageRank. Apart from these it also calculates on the basis of no. of links that point towards a particular site.
How and for whom is this useful??
Firstly, as I told earlier it is useful for the curious people who want to know the statistics of a website. Secondly, for the advertisers. Advertisers too want the statistics of a blog to put their adverts and they always look for higher traffic websites.
So finally, here are the list of the sites that will help you knowing the rank stats and traffic information about a blog.
1) Quark Base

This a website for the people who are striving hard to get the latest updated information and complete statistics about a blog. Or to be more specific this is a tool for the advertisers. This gives what is called the bio-data of the blog also the contact information and also about the feeds and also a great analysis of the site's traffic.
2) sitelogr.com

This is a very good site for knowing the ranks like world rank, Google PageRank or Alexa rank. This gives you a clear map about the Alexa ranking and also the similar sites with near ranks for the respective website. A great tool for overview of a website's traffic.
3) The Google PageRank
As the name itself says it gives you the information about the Google PageRank. It also enables the website owners to embed their PageRank notifier in their website.
4) StatBrain.com

This is a site that shows the average visits to a particular site. This also works well for blogs that use sub-domains.
5) The Alexa PageRank

It gives you a overview of a site's traffic like site's linking in, the locations of the visits and also the average visit per day etc.
6) Google Chrome Fans

This is a site dedicated to google chrome fans. This gives you a addon for the Google chrome and also live checker of Google an Alexa PageRank.

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