Page is a not externally linkable
-- Google SEO News and Discussion
---- Is Google Using a Position #6 "Penalty"?
Marcia - 3:50 am on Dec 28, 2007 (gmt 0)Thread source:: http://www.webmasterworld.com/google/3535274.htm
They can also incorporate additional metrics for evaluating the relative value of links, which aside from whatever else is happening, I believe they're doing.
Brought to you by WebmasterWorld: http://www.webmasterworld.com