i have read about Google flu but little bit confused about it and its work http://googleblog.blogspot.com/2011/05/mining-patterns-in-search-data-with.html
Strange I actually read a similar blog post about this a long time ago. I forget where I saw it, but at least the site beat google to the punch line even.
they still use some of their tools to determine the search activity of a particular place, maybe that's where they come with google trends..
I think that topic has something to talk about Flu literally or it is a help bu Google to fight this spreading sickness or just a good example for future works of Google Trend..