Page is a not externally linkable
-- Google SEO News and Discussion
---- Somethings Up Right Now! -- 30 domains just went "home page only"
g1smd - 1:52 am on May 3, 2006 (gmt 0)Thread source:: http://www.webmasterworld.com/google/34136.htm
It also seems to depend on what happened to a site, in terms of redirects, meta data, redesign, etc, before and after about 2005 June or July too.
Brought to you by WebmasterWorld: http://www.webmasterworld.com