Are you seeing consistent results across all datacenters?
At first I thought that the results I was seeing were from a DC that had been offline for service and the new results had not propagated to that DC yet, but that's not the case. Unfortunately, the top KW on one of our sites went from #4 to #25.
Today I'm still seeing the SERP's shuffling around a bit more than usual. Maybe whatever has been going on is not over yet.
Not across all dc's, I've checked about 4 .com .co.uk .de and .cz and they're all a little different. Was better for one term in .de than .co.uk!
Well it's looking better - site links are not back in .com but still there in .co.uk - but hit the UK sites filter and I'm still top but no sitelinks. There is definately a lot of movement - climbing nicely for a lot of terms with one site - another site looks like it's getting a bit of "authority to rank" (was a struggle and now doesn't need the effort with new terms).
We'll probably find the "Sunday Filter"

is being played with early.
Myself, I think I'm going give it a week or two before chasing new terms for more fragile sites of mine - ride the storm a bit and see where things land.
And here's something very odd. About three days ago I added a new 3 item menu to the home page of our
Hilton Head site. Google cached the page 5 hours agao, but that menu does not show on the cached page.
We also have a number of banner ads that use the rel=nofollow tag, and Google did not cache those either. I don't mind that, but I wonder why that new menu was not cached?
I have a
Google cache date of 29 Sep 2008 05:12:50 GMT for Hilton Head site in both .com and .co.uk logged in and logged out - Nothing on that right sidebar seems to be included!