http://mywordpress.com/plugins/seo-booster-pro/

Price: $39.95
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SEO Booster PRO is a Dynamic SEO Plugin for WordPress that automates your blog by tracking, analyzing and utilizing the incoming searches from the search engines.

SEO Booster PRO automatically tracks your incoming visitors from Google, researches the current ranking of the keyword, and then starts promoting the best suited keywords, after installation, you don’t need to do anything else.