dataguy - 4:27 pm on Feb 28, 2011 (gmt 0)
It seems to me that Google is looking at semantics and grammatical structure to determine quality of individual pages. If for some (stupid) reason they are looking at comments on pages as well as primary content, they that could explain why my most popular pages have dropped the most... they have more comments than other pages, and comments tend to be fragmented sentences.
This could also explain why newsy sites like HuffPo have seen a drop... their pages often have many comments as well.
Does make sense to anyone else?