I listen to podcasts and would love to be able to start them home and continue them while traveling, and vice versa. I think an easy way to do this would be to add the iPhone (speaker/headset/etc.) itself as a Sonos Zone / "room." This way when I started a podcast say at home, playing throughout the house, if I left, I could just "add" the "room" called "iPhone" and uncheck the others. Currently it's a very awkward process to start a podcast on your Sonos at home, say, then leave, and have to open the iPhone Podcast app, ensure the podcast is there too, and then find the same place in time you left off.