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CainIV - 2:26 am on Mar 10, 2007 (gmt 0)
It's doubtful that Google.com counted and applied this link to you this fast. More likely, you ran across one of these terrible DC's that of late have been throwing many sites around from top ranks to buried ranks. My bet is if you check your rankings on another DC things are normal.
They dropped us for our keywords drastically and some keywords they dropped us completely.