Xiph1980 writes "Experian Hitwise claims Bing and Bing-powered search to be more effective than Google. The success rate for Bing searches in the U.S. in July was 80.04%, compared to 67.56% for Google. The market watcher defines 'success rate' as the percentage of search queries that result in a visit to a website. Searches made through sites owned by Yahoo, which farmed out search to Bing under a deal struck in 2009, were also more efficient than Google. Those searches yielded a success rate of 81.36%. The claims of Hitwise don't explain why I keep finding things like Microsoft service pack download pages better through google than through bing."