How does Google handle duplicate content?

How does Google handle duplicate content and what negative effects can it have on rankings from an SEO perspective? Gary Taylor, Stratford Upon Avon, UK Have a question? Ask it in our Webmaster Help Forum: http://groups.google.com/a/googleprod... Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions:   / googlewmc   More videos:    / googlewebmasterhelp   Webmaster Central Blog: http://googlewebmastercentral.blogspo... Webmaster Central: http://www.google.com/webmasters/