BigDave - 7:00 pm on Jan 30, 2007 (gmt 0)

It's hard to say, but looking at a 30 day running average, it looks like EPC, eCPM and CTR have all stayed in a band of +/- 25% from the mean. The is on my most stable site as far as traffic and content, and the numbers are since I started in March.

There are some definite seasonal fluctuations within that band, and the site itself has had some SERP caused and seasonal traffic fluctuations that impacted my total income, in both directions.