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mzanzig - 6:40 pm on Mar 7, 2007 (gmt 0)
Sure, there are swings, and the daily swings are annoying, but I can not confirm "the new math" for my sites. Especially the eCPM seems to be affected by seasonal and niche-related swings. Looking at my 31-day-averages I can say that eCPM is more or less stable. P.S.: Please note that I said "constant", not "good" or "great" or "high" - just constant, and almost predictable. :-)
Did I mention that my EPC has been pretty constant for a long while?