The latest episode of "Fear the Boot" has a lot of very good material on running RPGs as improvised , collaborative storytelling: which is what I like to do. I'm sure most RPGers will find it of interest, and anyone who is trying to get character-players more involved and/or GM with less effort will find it of great interest.
Listen to this podcast to discover why I place such extreme emphasis on quick set-up and ease-of-use for Roll20.