Just like the lamb lying down with lion, but the big three search engines came together for a rare joint effort to announce the launch of a new feature that will help ease the world’s duplicate content problems. The new feature, called the tag tells the search engines what version of the URL is the correct one to want index.
The link tag goes in the
Official blog posts about the new link / canonical tag:
Coverage on other blogs:
Search Engine Land
Joost already created a WordPress plugin for this feature
3 Reasons to Use rel=canonical, 4 Reasons not to use it