Google UK has just been updated, I assume its the Panda update? and contrary to all the criticisms and whining about Panda so far, these serps look markedly improved.
I have so far only really had a detailed look at one very competitive product niche.
My initial observations are;
Not much movement in the first few results pages. But looking deeper down to page 50, shows some dramatic movements.
Some previously poor ranking quality/original content sites have risen, some significantly (e.g from page 38 to page 9).
Some sites with poor/little content have taken a drop, again some significant (e.g. page 8 to page 15).
Quite a number of crap blog, affiliate and article sites have dropped out of sight. Being replaced with genuine sites that users actually want to find.
There seems to be an increase in numbers of deeper (more relevant) pages, compared to home page listings.
It would also seem there is more emphasis on original quality content, the site's actual purpose, and far less on just volumes of links.
There a few exceptions, but these are far less than ever before!
Looks Really Good, Excellent Job Google :)