We frequently talk about the inaccuracies of Alexa data when looking at their reports and information presented. While Alexa can be a reasonable benchmark for establishing some form of search visibility, it should not be maintained as an authoritative source of information, because the data is heavily skewed towards toolbar users and their demographics and preferences, etc.
Here are two recent posts supporting this statement from well known (and respected) folks at our favorite little search engine. The original is on Peter Norvig's website and further expanded on by Matt Cutts on his blog last night.
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