list-of-the-highest-cpc-keywords

http://asli-indian.com/list-of-the-highest-cpc-keywords.html

http://www.wordstream.com/blog/ws/2011/07/18/most-expensive-google-adwords-keywords

http://mextena.com/top-paying-adsense-keywords-best-adsense-topics/

http://www.blackhatworld.com/blackhat-seo/adsense/348133-high-cpc-adsense-keywords-list.html

http://dailypocketmoneyfinder.blogspot.com/2009/12/list-of-high-paying-keywords-best.html

http://orangecopper.com/blog/list-of-200-highest-paying-adsense-keywords-updated-list-2010

http://2011highpaying.blogspot.com/2011/08/300-high-paying-adsense-keywords-2011.html