Tip of the Week: Four Good Keywords Tools by Chris Trayhorn, Publisher of mThink Blue Book, March 20, 2009 Every now and then it does no harm to revisit the basics and check out the tools you are using are as good as they might be. Google, Yahoo and Microsoft all offer their own keyword tools of course, but remember to take a look at the latest iterations of the classic tools: Wordtracker Keyword Discovery Wordze Spyfu 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.