After reading up on the new canonical tag by google I immediately looked at implementing it on our home-grown cms. It turns out that we’re already 301ing where we can, and the canonical tag would have little relevance at first glance.
http://www.mattcutts.com/blog/canonical-link-tag/
However, we use our own session management and sometimes a url like verynice.html gets turned into notsonice.asp?id=verynice when certain session functions kick in.
A quick hack into our header and now we use the canonical tag in order to tell google and yahoo about our content. As I’ve seen thousands of duplicate content issues in google webmaster tools, I hope this will have some effect.
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