Thanks. No mobile app yet, but for now you can certainly use it on iPhone browser (HTML5 audio integrates surprisingly well with the native playback controls) and you can subscribe to your channel in iTunes using the iTunes icon.

I've stuck a couple of skeptic podcasts in Science channel, but don't want to flood it, so I'll look at adding a separate Skepticism channel as there seems to be enough content for it. And there's already a Spirituality channel to balance it out :).