Sean,
The seven day map at http://average.miq.net/Weekly/markMM.html shows it
as even more dramatic. When I looked at the daily one, I wonder if perhaps
the demand of all those DNS servers re-querying for Microsoft was the
cause... but if that was the case, I assume (yuk!) we would have seen it
yesterday, too.
Have you ever seen spikes like this before? Any theories?
K