tedster - 6:14 am on Aug 1, 2010 (gmt 0)
Interesting clue here, maybe. I was researching this subject by doing various Google Searches around the "similar pages" theme, and Google gave me one result that was a newsletter about "relevant inbound links". It didn't even contain the phrase "similar page[s]" anywhere.
Hmmm... so the algo considers these two topics to be close, apparently: "links between pages" and "similar pages". I've long seen that the "similar" link exposes a lot of a site's place in the link graph, but now it seems worth a bit of a closer study. It's almost starting to look like the old Ask idea of web communities.
At the same time, I've seen some "similar" results that list tooth-and-nail competitors within and industry. These businesses would NOT be directly linking to each other, although some third party sites might be linking to both.
It's kind of unnerving to search on a company name and see Google give their competition a spot on that search result.