It is deninatily an ALGO tweak... it started on Sunday and just about rolled to all of the DC's by yesterday morning. A few sites of ours are doing OK... while others went on vacation.
some of my sites have gone down a few pages, and some of my sites have gone up a few pages, but 0 have vanished..
One of my sites that has co-op on it seems to have been penalized as it has gone supplemental, dropped out of the serps and when I do the site: command on it, the first result is not the homepage as someone else pointed out. When I do the site: command with the other sites that haven't been penalized, the first result is the homepage. One of my sites which dropped out of the serps a little while back has come back nicely and I have watched the new results propagate to almost all datacenters that mcdar shows. I hope these results stick. I didn't think that it was an update. I thought it was just taking time for the new infrastructure changes in the bots from bigdaddy to do their thing but who knows.
Exactly, 3 of my sites jumped in the SERP, remarkably these are new sites. While few of my old sites are holding their place firmly, but all others are on a group vacation with your sites.. The Site I am running coop on, is stable.