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tedster - 1:41 pm on May 5, 2008 (gmt 0)
I'm not seeing this one yet, but I'll keep an eye out. I don't usually check the same SERP frequently enough to catch a pattern like this.
That's a very interesting observation - however, it is a different pattern than the #6 bug. That one accidentally demoted a large number of urls from top positions to exactly #6.