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It's down the bottom of the front page and shows teh latest search terms/phrases that people have entered into Google which have resulted in them clicking a link which brings them to TWF - click on the phrase and you will see the page that the last person was taken to.
The bolder/larger the phrase, the more times it has been googled (and resulted in teh searcher coming here)
I personally find it interesting to see what people searched for and what information they actually received.