This is the application/functionality for podcasting that SHOULD be on the iPhone. Similar to the way podcasting works on Symbian S60 devices: you can download podcasts straight over the air (Wifi/3G) to your iPhone. Unfortunately, Apple has refused to list it on the App store as they believe it infringes on the functionality of iTunes. Hopefully Apple change their mind (or purchase the intellectual property from the developer and integrate it into a future iPhone firmware), in the meantime you can buy it direct from the developer here: