Google Webmaster Tool Will signal You on Duplicate Content Issues Across Your Domain

Today, Google webmaster tools has launched a new message alert to let site owners know when a particular URL doesn’t appear because Google sees it as duplicate of a URL on a different domain.

To be transparent about cross-domain URL selection decisions, we’re launching new Webmaster Tools messages that will attempt to notify webmasters when our algorithms select an external URL instead of one from their website. The details about how these messages work are in our Help Center article about the topic, and in this blog post we’ll discuss the different scenarios in which you may see a cross-domain URL selection and what you can do to fix any selections you believe are incorrect.

In this situation, please follow our guidance on cleaning your site and submit a reconsideration request when done. To identify cloaked attacks, you can use the Fetch as Googlebot function in Webmaster Tools to see your page’s content as Googlebot sees it.

Sources: 

http://googlewebmastercentral.blogspot.com/2011/10/raising-awareness-of-cross-domain-url.html

http://www.google.com/support/webmasters/bin/answer.py?answer=163634

http://www.google.com/support/webmasters/bin/answer.py?answer=1716747&topic=20985

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