Boxee is an open, connected and social media center for Linux and OSX (Windows not supported yet). At the moment it is still in an Alpha stadium, but I haven’t had much problems with it. You will need an invite to be able to use Boxee, not to worry, I’m giving them away.

Is Ubuntu suited for you? In this article I will try to give you some idea of the capabilities of Ubuntu to see if they fit your needs.