- iTunes has OPML export of your podcast subscriptions (File > Export Song List).
- Odeo has no OPML import, so you have to add items manually.
- Even when you've added them manually, no one else can view your list of Odeo subscriptions.
- Odeo has OPML export.
- H20 Playlist has no OPML import, so you have to add items manually.
- This is where I gave up.
In the end, it's easiest to transform the iTunes OPML to HTML and share that, but it would have been nice to have the OPML synced with and shareable in Odeo.