The following sites provide radio or talk shows in the Ogg Vorbis format:

2guystalking: 24: [1]

Two guys who love the hit Fox TV show "24" review each episode, and provide commentary, as well as humor.
[2]

Note: The 2GuysTalking Podcast Network [3] is a sponsor of the OggWatch™ project, as well as Twisted Lincoln, Inc.™ 

Dr. Bill The Computer Curmudgeon: [4]

Dr. Bill Bailey provides musings on computers and technology, as well as misc topics.

Blessings of Liberty: [5]

A liberatarian oriented online radio show about politics.

The Atheist Experience: [6]
         
The Atheist Experience is a show intended to promote secular views, but geared at a non-atheist audience.