Google "Insights for Search"
Google has just introduced a new tool called "Insights for Search" which allows one to track the popularity of search terms by geographic region, category, and time frames. This free tool is intended for marketers, but others may find it useful as well. Check it out at:
http://google.com/insights/search/#
Article about this appearing in the New York Times today "Google's New Tool is Meant for Marketers"


