Podcasting is the creation and dissemination of a series (episodes) of files (known as podcasts) for people to listen to on their computer or on a portable player. These files can be talk shows, music shows, recordings of talks and speeches and maybe people reading the texts of books. The genre has a wide variety of formats but podcasts are similar to a radio show (talk, music, variety) that can be played on demand. The name is a derivative of the one for Apple's iPod.
Podcasts covering a specific topic will not go here. They''ll get submitted to the appropriate area of ODP for that topic.

Example: A podcast about scuba diving would likely find a home in Recreation: Outdoors: Scuba Diving or a subcategory, for example. A podcast about diving in Hawaii may end up in Regional: North America: United States: Hawaii: Oahu: Recreation and Sports: Scuba Diving as well as the Recreation/ category.

mailing lists or forums covering podcasting.
Relatively comprehensive directories of podcasts. Directories = categorized, hopefully annotated collections of sites. It's a bonus if these sites are searchable too.
Link collections without a lot of structure are a poor candidate for listing here.
"how to" type of content as well as troubleshooting ideas.
Contains podcasts with are religious in focus.