Liferay - The CMS for our visionOntv project

Liferay Portal 5.0 includes the core collaboration tools needed in
today's enterprises, including:

--  Blogs, Message Boards, and Wikis

--  A dynamic tagging system for user-driven categorization

--  AJAX-based mail client that allows users to send email
     directly from the portal

--  Shared calendars, chat and polls

--  Direct portlet publishing to the MySpace and Facebook networks

--  Ability to leverage iGoogle gadgets directly within portal
     deployments

All tools in the suite are complemented by a common set of
enhancements such as RSS support, email notifications, comments,
rating systems and social bookmarking.

The is an existing Liferay TV project http://www.zaplive.tv/home