download videos from tvo.org:

find the podcast url for audio (e.g. http://www.tvo.org/podcasts/theagenda/audio/TAWSP_Debate_121407.mp3)

change audio to video, and mp3 to mp4, like this:
http://www.tvo.org/podcasts/theagenda/video/TAWSP_Debate_121407.mp4