The news stories that nsauser reports are almost three weeks old at this point, but clearly the story he points to has a lot of traction. I'm thinking it isn't so much a glitch as a new way of weighting results that Google is testing... and yes, it's a very weird result.
Dymero and Wilburforce - Are the stories that you're seeing in any way high profile? And, what's your default results per page setting when you look at these? IMO, using anything higher than 10 results per page can cloud the issue. If we're talking about results seen at different settings, that would definitely be clouding communications.
Trying 10 results per page vs 100 results per page, though, and comparing them to see what's different might indicate whether Google is using a new type of clustering. Traditionally, clustering has been per domain. Here, it might be per "perceived topic", for want of a better word right now.