jimbeetle - 7:05 pm on Jan 8, 2011 (gmt 0)
I basically just want to plop this here as a reference because it is something that at first look can appear as traffic throttling. From a Webmaster Tools discussion [google.com] question answered by Goog employee AsaphZemach:
Why are the number of impressions (24,900,000) for our web site stays exactly the same for the last three months?
When you see 24,900,000 you should really think of it as 25M +/- 2.5M. Which tells you that the number of impressions has remained within plus or minus 10% for the duration you are referring to.
Somewhat tantalizing, but would really need duration for above and then daily/weekly breakdowns to draw any sort of conclusion as to possibility of "throttling."
via RustyBrick at SER