I'm beta testing Odeo, a new app for managing your Podcast subscriptions. It looks like they have two tools right now:
1. Manage and sync your MP3 player and podcast via their application. I believe it was built off of the iPodder framework. However, I use iTunes which now has the podcast directory and subscriptions built in. (even though I really like iPodder better).
2. A way to consolidate and manage all of your subscriptions in one place. They then offer an XML file that I can subscribe to in iTunes that pulls in all of my podcasts. It's a little strange, but I'll play with it.
They will be offering podcast publishing tools soon. That is the reason I really wanted to join in. I hope they will create an easy tool set to publish your own podcasts. So far it's been hard to find that, but maybe I'm just looking in the wrong places.