From Common Tag
To get involved in the development of Common Tag, please join the Common Tag Yahoo! Group. The Yahoo! Group is the primary method of communication for all things related to Common Tag. Feel free to post questions, join / start discussions, and provide updates on how you’re using Common Tag in your sites and applications.
If you’re a publisher looking for instructions on how to tag your content using Common Tag, read our Quick Start Guide or visit the Specification section of the site. If you’re looking for tools to help with tagging your content, you can use Zemanta, an automated tagging tool that supports Common Tag.