Matt Cutt’s Google videos get plenty of traffic, but there are plenty of great videos from other members of the Google Search Quality Team.
Greg Grothaus of Google’s Search Quality Team gives a great run through on Duplicate Content issues.
http://googlewebmastercentral.blogspot.com/2009/09/duplicate-content-and-multiple-site.html
Many duplicate content issues creep in way ahead of SEO teams being involved and are baked in to site architecture. As part of improving search results (rather than SEO per se) it’s important to be aware of the dilutive effect of duplicate content and lack of canonicalisation. Dupe content issues should be part of every web developers formal (or informal) training if we want to see less problems with large, international websites.
Go To: Good Google video on Duplicate Content Issues http://tinyurl.com/dupe-content
