muzza64 - 9:10 am on Aug 22, 2012 (gmt 0)
Noticed this today on a two word singular phrase (the plural has normal results). It's one of three phrases people associate with our niche, so quite general but the site at the top (with two site links, snippets for each and a "more results from..." link) has the phrase in it's domain name.
The top site is quite a minor player in the niche so not the main place to go.
I don't see any reason for it, it just looks like testing to me. I wonder if different people in different locations see different things for the same phrase......if so, then it's a split test and the phrase in question could just be randomly selected (e.g. show every user a page of 7 results for one search and see how they react).