The Purl Diving podcast published episodes via an RSS Feed. You can subscribe to the Purl Diving Podcast RSS feed using a "feed reader" or aggregator program or web-based service. This will let you know when new episodes or blog posts are published; some will automatically download the podcast for you, while others will require you to download manually.
You don't need to have an iPod to listen! Each episode of the podcast is downloaded as an MP3 file that can be listened to on your computer using media player software and speakers or headphones.
You can also download it to and play it on any "portable media player" or "MP3 player" that supports playback of MP3 files.
Links to both the RSS Feed (for subscribing with a feed reader/aggregator) and the Purl Diving subscription page in iTunes are in the sidebar; click the appropriate icon or button to subscribe (it's free!) to the Purl Diving podcast.