You don't have to have an iPod to get these MP3 files. ESI episodes can be downloaded each week using the "Download" link at http://podcast.acwi-online.org/
You can download them individually by just visiting the link above, however many people find it convenient to "subscribe" meaning that new episodes will be delivered each week automatically.
How do you do that? You'll just need podcast receiving software. The most popular option is Apple's free iTunes, which is available for bothWindows and Mac.
Still confused? Watch these simple explanation videos.
~ This one <http://www.commoncraft.com/podcasting> tells you what podcasting is and how it's different from broadcasting.
~ This one http://www.commoncraft.com/rss_plain_english> tells you more about how to subscribe to a podcast or blogs.