Robert_Charlton - 6:30 pm on Apr 22, 2008 (gmt 0)

And officially, Matt Cutts did not confirm this as a new algo...

Hard to understand this, except that part of what I'm seeing appears to be be an ongoing link re-evaluation of the kind that has been going on for years, only now it's being increasingly applied to less competitive searches... perhaps factors and filters related to authority, affiliation, and trust.

The diversity thing is what appears to be new, but again, Matt has been mentioning for quite some time how Google likes to show "different kinds of sites" in the top results.

(I should add that I can't find any reference to anything Matt has said about diversity, but I know I've been referring to the idea of different kinds of sites for a while. It's most likely he said it at a conference. Maybe someone else can dig out something that's online).