This morning, I reported at the Search Engine Roundtable that Google was testing some type of sublink to the search results, to show additional search results from the same site, but not as indented results. It is really hard to explain, so here is a picture provided by BlogsDNA:
It seems to currently be forum related, but I am not able to reproduce these results on any browser or platform. I personally like it, because forums do typically contain a lot of duplicate threads, but with slightly unique replies and questions. This has not yet been confirmed by Google as an official test, but it wouldn’t surprise me if it was.