tedster - 10:16 pm on Dec 17, 2009 (gmt 0)
I had a site that dropped from #1 to #2, switching spots with Wikipedia for three days in early December. The search volume only fell about 20%, much less than the AOL data would suggest. And the site then went back to #1. Not sure if that quick return was from an algo tweak or the high click-through rate.