googlewebmastercentral.blogspot.co.uk/2009/02/specify-your-c...

Carpe diem on any duplicate content worries: we now support a format that allows you to publicly specify your preferred version of a URL. If yo ...

searchenginewatch.com/sew/opinion/2066270/the-canonical-tag-...

How the very useful rel=canonical tag solves many common SEO problems that exist around duplicate content issues.

support.google.com/webmasters/answer/139066

This article describes how you can use canonical URLs to improve link and ranking signals for content available through multiple URL structures or via syndication.

www.mattcutts.com/blog/rel-canonical-html-head/

I answered an interesting rel=canonical question over email today and thought I’d blog about it. If you’re not familiar with rel=canonical read these pages first. Then watch this video about rel=canonical vs. 301s, especially the second hal ...

www.concept-br.de/blog/canonical-tag-for-joomla/

Joomla unfortunately has no built-in-function for setting the canonical tag. We have to get the right seo link from the menu items and set it manually.

We coded a small PHP script which uses the Joomla-API to get the seo link from the currently ...

searchengineland.com/googles-matt-cutts-on-publishers-with-d...

In a video released by Matt Cutts, Google’s head of search spam, Matt said publishers who publish similar or duplicative stories on different URLs may use the rel=canonical tag to help consolidate the PageRank of the stories and avoid any issues ...

www.metatags.info/rel_canonical

By adding the rel=canonical tag you inform the spiders which page is the main page if you have double content.

www.youtube.com/watch?v=zW5UL3lzBOA

Hey Matt. I had a lingering question about using rel=canonical vs. 301 redirects. It takes longer for Google to find the rel=canonical pages but 301 redirects seem to lose impact (link juice) over time. Is there similar churn with rel=canonical? Sam Cr ...