Where things go wrong with Alexa rankings
The concesus is that the web sites with SEO and webmaster attention cruise up the alexa rankings, but don't necessarily have real traffic. As observed by Matt Cutts.
A great image of where things go wrong with alexa is shown below.
The figure shows that above the 50,000 ranking, all traffic figures are distorted. You dont get a straight correlation between ranking and traffic. Probably due to the low sampling data, with insufficient Alexa toolbars visiting sites above 50,000.
Matt's advise is "use the google toolbar". Enclick's advise for accurate relative traffic figures on your competition is: get NetNielsen or Hitwise service, or ask us.

Comments
Paul,
Thanks for using our data as example. Pleae use this URL to link to the original post in Spanish: http://www.merodeando.com/blog/archivos/2006/05/11-alexa-ni-tanto-ni-tan-poco.php (the one you used is for trackbacks).
Posted by: Julio Alonso | June 1, 2006 2:10 PM