A few years ago I joined fellow twitter users Advancedflea and LtKD118 in making a podcast based around Portal and Valve games in general. We streamed them live to an online audience. Viewers could interact with us via the chatroom. We chatted about anything we fancied during the live stream but I edit them down for time and to keep the podcast relevent to Portal/Valve. - It was a great experience and I have kept the podcast's here for nostalgia.
Episode 1
Aperture Radio episode 1 by Wheatleycore
Aperture Science Radio Episode 2 by jamesandrewstewart1