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SEOPTI - 12:25 am on Dec 4, 2007 (gmt 0)
They are simply dropping the URLs where they detect similar patterns within your domain or across different domains on the web. [edited by: SEOPTI at 12:26 am (utc) on Dec. 4, 2007]
What I see (and I am quite sure about this), they have improved their duplicate content detection regarding different domains.