http://www.articlealley.com en-us editorial@articlealley.com How To Measure Search Engine Marketing ROI Copyright © 2005 Charles Preston Click Response http://www.clickresponse.net/ According to the Search Engine Marketing Professional Organization (SEMPO), advertisers spent $4 billion in 2004 on sear... http://charlespreston.articlealley.com/how-to-measure-search-engine-marketing-roi-5054.html 15th August 2005