Overcast and Huffduffer
Marco Arment has released his podcast app Overcast for iOS—you can read his introduction to the app.
It plays nicely with Huffduffer. If you want to listen to any Huffduffer feed in Overcast, it’s a straightforward process.
It’s pretty straightforward to subscribe to Huffduffer URLs in other iOS apps too. Matt has written up the process of using Huffduffer and Instacast. And there’s also a write-up of using Huffduffer and Downcast.