One of the first things anyone embarking on a search marketing effort learns is that effective selection and use of keywords can make or break a campaign. Keyword research is an art, but the appropriate use of tools can help you practice the art much more effectively.
The folks who offer Wordtracker, one of the most popular keyword research tools, invited a number of search marketing experts to contribute their thoughts in a guide to keyword research that they're making freely available. I've got a review of the guide in today's SearchDay article, An Experts' Guide to Keyword Research.
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