Probably best to get a podcast client on your phone and search for "40 Hours" in the directory. Then you can listen in comfort. Castro is my favourite on iOS (and Irish made!). As for Android...no idea. Pocket Casts maybe?
Should stream from iTunes properly. I would put them on Soundcloud but you can only put up four hours before they start charging. The pricks.
That's so sweet of you! Glad you're digging the show. If you have a question, we'd love for you to call in or email :).
The native iPhone podcast app is kinda crappy, so if you're cool spending a few bucks on an app, check out http://castro.fm/. It's the best one out there.