TheMadScientist - 8:29 pm on Mar 3, 2011 (gmt 0)
Obviously, it would be something to look at on a site-by-site and page-by-page basis, but ... The OP in this thread said they looked into the pages that dropped the most and they happened to be thinner than even they remembered ... I think there's quite a bit to be gained from the statement Dead_Elvis makes in the OP and the 'biggest droppers' is definitely where I would start looking for answers.
Sometimes I think people over-think the situation...
I'd keep it simple for finding a starting point.