Tip of the Week by Chris Trayhorn, Publisher of mThink Blue Book, April 22, 2009 Ann Smarty has a nice piece up discussing the different approach needed when researching keywords for an established site rather than a new one. Beginning with an analysis of referrals she describes a methodology that is simple and effective. Go take a look here. Filed under: Revenue About the Author Chris Trayhorn, Publisher of mThink Blue Book Chris Trayhorn is the Chairman of the Performance Marketing Industry Blue Ribbon Panel and the CEO of mThink.com, a leading online and content marketing agency. He has founded four successful marketing companies in London and San Francisco in the last 15 years, and is currently the founder and publisher of Revenue+Performance magazine, the magazine of the performance marketing industry since 2002.