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netmeg - 3:03 pm on Oct 12, 2006 (gmt 0)
This is exactly what happens with one of my major client sites. They're ranked between 1-10 on their top 20 phrases, Yahoo does an update and they tank, and then over the following month or six weeks, they climb right back up to where they were before. All without my doing a thing to the site.
I don't touch anything. Every three months Yahoo considers my site an authority, then pulls it and places it around 25th. Happens usually during every update.