The following sites provide content regarding Free Software or GNU/Linux in the Ogg Vorbis format:

Linux News Log: [1]

An online radio show focusing on news and information related to GNU/Linux.

"Recordings about our Philosophy" at the GNU Project: [2]

A selection of recordings of speeches by Richard Stallman and others regarding the principles of Free Software and the GNU Project.

Linux Reality: [3]

An informational online radio show oriented toward new users of GNU/Linux.  As of March 2008, the show is no longer producing new episodes, however old episodes are still available for download or purchase.

LinuxLink Radio: [4]

An informational online radio show geared towards embedded Linux developers.

Fresh Ubuntu: [5]

A distro-specific show focusing on Ubuntu.

Linux Basement: [6]

An online radio show about GNU/Linux, Free Software, and technology in general.