I don't know if it's a coincidence but since adding a small "coming soon" section at the top of my site my cpm has risen 3% on average over the last week. I used the stats from what people were searching for on my site and wrote an article about it.I haven't published this article yet as I'm not due to publish again untill next week so I thought I would advertise it first. I thought it might be a good way to get people to bookmark my site and get returning visitors.(Not forgetting the bookmark button!) Do you think this is a coincidence? You can see it at the top of the page in my pottery site (in my sig).
I would say 3% is waay outside the daily range of daily up and down movement if you are looking at xx,xxx views, if you are looking at <100 views, 10% would be no surprise