David Szetela is pretty well known in the SEM field, and his free ebook is a great guide to advertising on the google content network. I highly recommend downloading it (free!) here: “Profiting From the New Frontier of Content Based Internet Advertising”
Summary Profile on David Szetela:
Online Advertising expert David Szetela founded Clix Marketing in 2003, following a 25-year career in technology sales and marketing as an executive at Apple Computer and Ziff-Davis Publishing. He is active in the Search Engine Marketing Professional Organization (SEMPO) and was the author of two lessons in SEMPO’s Advanced Search Advertising course. His writing has been published in his weekly column as a Search Engine Watch Expert, Profitable PPC , in the SEW Blog, in online publications like Search Engine Land and in the Clix Marketing Blog. His weekly Webmasterradio.fm show, PPC Rockstars, is broadcast every Monday at 4 PM Eastern time. He is a frequent speaker at industry conferences like PPC Summit, Marketing Sherpa B2B Summit, SMX and Search Engine Strategies.
Rishi Lakhani is an independent Online Marketing Consultant specialising in SEO, PPC, Affiliate Marketing and Social Media. Explicitly.Me is his Blog. Google Profile