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The Global Peace Index, which has just released its 2010 rankings. See them at As noted on the website, 149 nations of the world have been ranked by their peacefulness and the results have stimulated some very interesting analysis. 
Daniel Stauffacher, former Ambassador of Switzerland & Chairman, ICT4Peace Foundation and Maria Cattaui, former Secretary General, International Chamber of Commerce, former Managing Director, World Economic Forum have endorsed the Global Peace Index since its inception.