Google announced the release of a new way to tell them if a page is duplicate content, and they should send visitors to another page. This lets them know that you are not trying to pass duplicate content into their index and helps the ranking of your main page.

After the post is saved, it will include the proper information in the head section letting Google know where the original post is.
This has been tested on Wordpress 2.7. Let me know if you have any issues.
Broken link…
RoCkR!, thanks for the heads up…link fixed.
That’s fantastic that it helps the rankings of your main page, especially since it will redirect Google to the original post instead of the duplicate content.
I think that the canonical tag is important only for wordpress based shopping sites. It has not much value for normal blogs which do almost have unique content in all posts.
anyways, thanks for the plugin
A lot of people don’t keep in consideration the duplicate content that they send out to the world. Google will punish you if you are found doing it constantly. I think content plugins such as this help everyone out. A lot of people that own blogs and small sites are necessarily programming or technical people…. so they probably don’t know what a canonical tag is.
Tools like this make a lot of peoples lives a lot easier, and they don’t have to worry about search engines pestering them