Rev=canonical: url shortening that doesn't hurt the internet

There's already a rel=canonical element supported by the major search engines:<p><a href="http://ysearchblog.com/2009/02/12/fighting-duplication-adding-more-arrows-to-your-quiver/" rel="nofollow">http://ysearchblog.com/2009/02/12/fighting-duplication-addin...</a>