That is exactly why their PR is high, because of the Adobe PDF Reader and the Adobe Flash Player. Any site that requires flash creates a link to their site for the download. Any site that has a PDF puts a link to the site to download Adobe Reader. There are millions of sites that do this. Can you even imagine how much traffic that generates daily? I wonder how much bandwidth they use per day?
This statistic really doesn't matter much. but it is fun to talk about with you fellows. Narender Pal Singh
Google has just scale down the Page Rank. That's it. WIth every update more and more sites were getting high page ranks of PR6 and PR7 due to the presence of heavy interlinking (natural or artificial) so they said, fine..lets scale it down and let them grow again. I can't see sites like yahoo having PR10 or 9 or 8 having any significance whatsoever.
Yahoo has no. 1 on Alexa because all services of yahoo have the same main domain yahoo.com but not same in the case of Google, each country has a different domain like Turkey google.com.tr, google.de, google.co.in So international traffic is not considered.