Which is Best Google Adwords ebook ? AdWords is Google's flagship advertising product and main source of revenue.Google Money Pro (GoogleMoneypro), Beating Adwords, Google Cash (Google Cash).
I found a link in my research for answer to this question.
http://hubpages.com/hub/google-adwords
waiting for some more Answers....

here is something you can research online for your adwords campaign so that you know what your competitors are bidding on: http://www.keywordspy.com