The following links are relating to audio and video podcasts that are for Scientific Education:

Radio National's The Science Show


Nature Journal Podcast

ABC's The Lab - Podcast

The Naked Scientist Podcasts

Newscientist Podcast

Scientific American

Chemistry Demonstrations and Videocasts
From (a commerical site but lots of FREE vids as well)

Science Misconceptions explained on Podcasts

BBC GCSE Bitesize Podcasts