The growth rate for Wikipedia.org over the last two years was over 680%. The blue line represents U.S. visits to Wikipedia.org, the red line shows the % of visits that Wikipedia received from Google. As of last week, Wikipedia.org was the #1 external domain visited from the Google main search page (after images.google.com). Does anyone know why there was a massive surge in search to Wikipedia in July 2005? http://weblogs.hitwise.com/bill-tancer/2007/03/wikipedia_search_and_school_ho.html