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engine - 4:44 pm on Feb 24, 2009 (gmt 0)
This follows on from
Ask Goes Canonical, Too [blog.ask.com] To help meet this challenge, Ask is announcing today that we are joining forces with other major search engines in a timely partnership to support a special search index feature called "canonical URL tag".
Search Engines Agree on "Canonical tag" [webmasterworld.com]