SEOmoz | 10 Steps to Advanced Keyword Research
http://www.seomoz.org/blog/10-steps-to-advanced-keyword-research

Some keyword research is surface-level, fire and forget type stuff. If you just need to see relative volume levels, then a basic keyword research tool is all you need. If, however, you want to really dive deep and get the full skinny on your keywords, I'd recommend having each of these data points.

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