The "950 Penalty" really does describe this thing; couple of our sites that got hit with this initially were sitting in the 600's, but over the past two days slid into the 900's.
One day first page, next thing you know you’re at # 950. All we can guess at this time is a rather dramatic penalty. Always felt we were within the guidelines; so either we are not within them, or we are suffering the effects of a change and reside within a sector best described as collateral damage.
I guess in Fairness to Google their only concern is the user; so that begs the question is the user better off with this collection of sites resting in the 900's?