From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
A podcast is multimedia file (usually a sound file) available for download. Despite the name, you do not need an iPod or similar device to listen to them. Any computer capable of playing mp3 sound files will play podcasts.
There are currently several different podcasts relating to Battlestar Galactica:
These same podcasts are also available from the iTunes Music Store from Apple Computer. The iTunes software is free for both Microsoft Windows and Mac OS X computers.