Anyone have any data on the clickthrough rates of share (e.g. Digg, Mixx, Delicious) badges placed in the footers of blogs or news sites, e.g. the Chicago Tribune (http://www.chicagotribune.com/news/chi-112308-allergens-whole-foods-nov23,0,241722.story) or CNN (http://www.cnn.com/2008/POLITICS/11/22/obama.vetting/index.html)?