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

Twisted Lincoln, Inc's Online GNU/Linux Instructional Class: [1]

Twisted Lincoln, Inc.™ provides video in Ogg Theora format of it's periodic GNU/Linux class. The Ogg Theora content can be watched via a streaming Java applet online, or downloaded for offline viewing.

"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, including many filmed speeches available in Ogg Theora format.