I recently got an iPhone, and quickly found I would rather use the Zune software instead of iTunes. So I turned on the manual syncing, and I can just drag the mp3 files I want over to the iPhone in iTunes. The problem is that some podcast mp3s show up in the podcast section and some do not. It wouldn't really matter except that only podcasts save their play position.
So the question is: how does an iPhone know which mp3s are podcasts? I assume it's a certain field in the ID3 tag, but I don't know which.
Edit: I found a solution for me. I had iTunes watch my Zune podcast folder. So when I launch iTunes, it seems to figure out all those files are podcasts. I can drag them over to the iPhone and they work as intended.