Robert_Charlton - 9:23 pm on Mar 14, 2008 (gmt 0)

Co-occurence data.

Interesting thought. A client has Sitelinks for a search that contains a collective noun which semantically encompasses all of the links. It's as if, say, the Sitelinks displayed include the words Red, Green, Blue, Yellow, Orange, etc, and we get Sitelinks on a search that includes the word "colors". I hadn't thought the site was particularly well optimized for the collective noun, and was surprised at the Sitelinks on this search.