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On the downside, EPC and eCPM have been lower for May 1-19, 2007 than during the same period in 2006, although the gap has been narrowing in the last week or so.
I think we are mostly talking traffic here. Was your traffic very low yesterday?
Actually, the OP was talking about CPM, but in terms of traffic, yesterday was my best Saturday in quite a while. Maybe I got the fed-up-with-football crowd who were ignoring the FA Cup Final. I usually do pretty well during the Super Bowl, too. :-)