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deadsea - 9:38 am on May 1, 2008 (gmt 0)
I think it is pretty clear that Googlebot itself was having problems those days as opposed to not crawling popular sites as much for algorithmic reasons. (Which takes a load off of my mind.)
The 17th, 23rd, and 24th were the weakest days for us as well. The stats pretty much mirror exactly what kms11 is showing.