[sphere]

Is it possible to add a podcast feed by URL? I have some that are not available on iTunes.

Nope, sorry. I also don't plan on developing that.

Awesome addon, the only thing i seem to be missing is a way to see what new podcasts where added to my itunes podcast subscriptions since the last time i used the addon. Even 'just' a list of podcasts by date across my subscriptions would be much appreciated.

I don't know how easy or hard it would be to code that piece of functionality. Hopefully it could be added without the addon having to pre-download each new podcast, since i'm using XBMC on an Apple TV with limited storage.

Keep up the good work!

You can mark podcast-entries as watched using the "w" key on your keyboard, not sure how to do that with a (apple) remote.
Regarding your idea to show the podcast-entries from multiple podcasts in one view: I will think about that but the possibilities are limited. It would require multiple requests which would result in a slow gui.
I am busy with other add-ons at the moment but after that I will have a closer look.

regards,
sphere