Definate backlink update, PR I'm assuming will be coming very very soon.
The shifting has been all over the place throughout the last four days, with the most that I've seen being at the 216.239.39.104 datacenter... also have had some reports of differing results for some terms comparing the east and west coast of the US, so some shifts are definately still stirring. I've been checking all comparable 216.239 datacenters for the last few days and a few of the tail end 99s have also starting mixing a touch, so check out 216.239.59.99 and 216.239.57.99 as well.
Seems like some of these SERPs rolled back to pre-last update, which seems odd, but could be just a reflux of new terms which toggled results into the same placement as before, no idea really... will have it all figured out soon though h0mi3s
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Good luck with the SEO everyone, may Mr. Google enjoy our company
FF