Good article, thank you, I am relatively new to podcasting, but have found that it is very important to let your upcoming guest know in advance that it is a conversation and not an interview. Ahead of time, I send a link to the podcast so that the guest knows the vibe. It has to feel informal and where possible we have the chat with a coffee in hand. Another important thing is to go with the flow and don’t set a time limit, if the conversation is flowing, then let it flow until you feel it is time to finish up.
There is also a very good podcast on the art of interviewing called ‘The Outerview’. I found this very helpful.