Google, Yahoo and Microsoft have togheter announced the support of a new tag for web development where you can specify your canonical links. The point of this is to enable webmasters themselves to “point out” which page contains the original copy of certain information in case multiple copies are shown on the same page. In essence, if multiple links into the website can display the same content you now have the ability to point the search engine to the page that you would rather have indexed.
The code is quite simple, on each page where the information can be found simply add the following tag:
<link rel=”canonical” href=”http://www.example.com/destination.php” />
This will inform the search engine of which of the pages is the true origin of the information and which are only redundant copies. For more detailed explenation of the new tag visit the Official Google Webmaster Central.
I bet many CMS authors right now are digging into their code to add support for this new convention.