The Global Peace Index, which has just released its 2010 rankings. See them at http://www.visionofhumanity.org. 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.