There is a web intelligence company called alexa.com, which gathers information using a toolbar (they claim to have millions out in cyberspace) installed on users computers. If you go to their site you can enter any address and get an idea of how much traffic that site gets. It isnt accurate in the sense that it doesnt capture traffic on computers without their toolbar (so there may be skewing between topics), but it does give you an order of magnitude estimate of how popular a site is.
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