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freitasm - 9:24 pm on Oct 12, 2003 (gmt 0)
I have a spreadsheet with CTR, CPM after CPC, EPC and I've noticed a little drop in EPC (consequently CPM). The CTR is constant for my site and impressions in the last three weeks went up a little (thanks to some articles I've posted that attracted lots of readers).
Not disclosing numbers, but as an overall comment, yes.