I think you are all up to date with the Canonical URL: Google, Yahoo, Live, the jointventure versus unintentional duplicate content ;) Learn more on Matt Cutt's blog.

It's a somehow cool thing but it fits best Wordpress Blogs where URLs can get into trouble every now and then. This is my second plugin related to Wordpress URLs after the Permalink Diet, which I will update these days with a bunch of new extra features based on this very plugin.
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