http://djpeterworth.com/mixes/podcast.xml

Manually subscribing to a direct feed using Itunes
Open iTunes. Select Menu > Advanced > Subscribe to Podcast. Then type (preferably copy and paste) http://djpeterworth.com/mixes/podcast.xml into the resulting pane. You will automatically receive new episodes as they are published.

Manually Subscribing using another Podcasting tool
Copy and past http://djpeterworth.com/mixes/podcast.xml into your preferred podcasting tool software (e.g. Odeo, iPodder, etc). You will automatically receive new episodes when they are published.

Learn More About Podcasts and feeds
Bring yourself up to speed on Podcasting and feeds by visiting the Official Apple Podcasting Page and also reading the definition of Podcasting at Wikipedia.