tedster - 12:01 am on Aug 2, 2010 (gmt 0)
Google certainly has improved their "Similar" results. They used to depend on links alone, and many sites that weren't "similar" at all would be displayed. Now there's a much deeper intelligence showing through.
This whole area recently came to my attention because Company A's competitors are being displayed at the bottom of a search for [Company A], but there are no "Similar pages" being displayed for searches on the competing company names. It does seem like an inequity, but I don't know that I can do much about it.