This website (owned by Amazon) allows you to discover details about any website. Type in the URL and it will tell you the site's world ranking, how many page impressions the website gets, total number of users, and the length of time visitors stay on the site. It also provides a traffic history graph of the site. Another useful feature is that you can compare the records of any two sites.
http://www.alexa.com
Full Version: Alexa
Just had a look at this John - certainly looks interesting. It will be worth a little further investigation I think. Thanks for the link. 
Nice service! 
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