AV Linux is a free shared downloadable and installable snapshot ISO image based on Debian/GNU Linux pre-configured to facilitate use as an Audio and Video production workstation OS. It is really intended to just be that simple, an AV production system prepared and shared by a single user with some practical experience in setting such things up. It is not really intended to be a full "Linux Distribution" in the proper sense.
For further information: http://www.bandshed.net/avlinux/