Robert Michel wrote:
BTW Why does Alexa do not rank wikipedia.org on their ranking of Encyclopedias??? http://www.alexa.com/browse/general?catid=251&mode=general
Because dmoz.org doesn't list Wikipedia under Reference -> Encyclopedias,
but under Computers -> Open source -> Open content -> Encyclopedias,
and Alexa uses the categorizations of dmoz.org.
There is a symbolic link (@) from Reference -> Encyclopedias -> Open Source to the category where one can find Wikipedia, but Alexa doesn't seem to follow that link.