There are many PR10 websites www.adobe.com is PR10 For a full list check this - http://www.searchenginegenie.com/pagerank-10-sites.htm www.doheth.co.uk/info/list-of-web-sites-with-high-page-rank.php digg.com/business_finance/Updated_List_of_Google_PageRank_PR_10_Websites Thanks Ishan
Google said so it is so My guess would be tho, a lot of sites linking to the bio's / info pages. Sites like that get tons of free one way links.
microsoft.com whitehouse.gov macromedia.com adobe.com (already mentioned) there is like a dozen other sites with PR10 - dont know all of them from the top of my head
i also noticed that yahoo were PR10 the other day, Google UK is only PR8 i beleive. and no, there are many PR10 sites including nasa, adobe and bbc.co.uk also used to be PR10