Doesn't the old Alexa service already provide the main part of this (related sites) ? In fact, that is integrated into later versions of Netscape as the "What's related" popup.
-- Join the ExI/>H SETI team today: http://setiathome.ssl.berkeley.edu/cgi-bin/cgi?cmd=team_show&id=393 -------------------------------------------------------------------
"It IS possible." - Vincent, _Gattaca_