achronic - 11:36 pm on Mar 19, 2008 (gmt 0) My theory is my link profile is still showing too much unnatural linking patterns.
I've got this happening today as well. Very strong pages on my site so there couldn't be duplicate content problems (1k plus inbounds to each). It's taken out probably my top 6 pages (with 60k+ indexed pages). The only common thread I've found is these were pages I've heavily promoted in the past with paid links.
My theory is my link profile is still showing too much unnatural linking patterns.