If your new to podcasting it's basically just on demand media content. You subscribe via a podcatcher (or aggregator) to podcasts from websites / channels that your interested in and the software downloads the content for you. The content is then available on your machine for playback at your leisure.
If your an iTunes user you can follow this link and all should be well. For the rest of you, point your favourite podcatcher to feeds.feedburner.com/polymorphic/podcast or use the extra features from Feedburner such as subscribe by email.