dusky - 2:29 am on Mar 31, 2010 (gmt 0)
I manage a lot of sites and many are US based in different servers, ownership and locations, I get alarmed (for better or worse) when I notice a considerable and consistent shift in the SERPS for at least a handful of them when I know there no structural or design changes were made for months apart from the normal day-to-day content additions.
It may be bizarre, but probably obvious, I seem to notice a strong correlation between SEO threads inflation all round the net and G*'s movement, when G* does something like start the shaking of the SERPs and the knee-jerk reactions which leads to posts on those forums including this thread. Say I participate in 10 well known forums such as WebmasterWorld, when there are minor tremors happening, less than 20 posts per day in all of them, but when a tremor registers 6-7, posts and replies are in the hundreds, from those who lost ground and indeed from those who GAINED IT from them!
Just an observation, when on a night shift one think of all sorts to pass time when you have a break!