http://www.alexa.com/site/company/announcement
In recent months we've heard from our Alexa users that understanding Internet usage beyond Alexa Toolbar users was increasingly of interest. Ask and you shall receive!
We listened to your suggestions, and we believe that our new rankings system is much closer to what you asked for.
We now aggregate data from multiple sources to give you a better indication of website popularity among the entire population of Internet users.
How It's Changed
More Sources: Alexa rankings are now based on more sources of data to give a better indicator of website popularity.
Improved Methodology: Normalizing traffic from a global panel to provide consistently accurate rankings for all countries.
Better Rankings: The rankings are now an even better indication of website popularity due to new and improved algorithms.
Mike
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WhoPaidMe - Cheque names, ePassporte IDs, Alexa data, combined review scores, new site launches & promos, for every sponsor and every niche!