Some of these have already been mentioned, but I will give them my stamp of approval:
Eaten By a Grue goes over all the old Indocom games, one per episode:
http://monsterfeet.com/grue/The Short Game is for short videogames, including IF, and covers IFComp in depth every year:
http://www.theshortgame.net/Radio K: Ask/Tell is Photopia/Varicella/9:05 author Adam Cadre catching up on recent-ish IF (this century), year by year:
http://adamcadre.ac/audio/ [use
http://podsync.net/0ark if you want to add it to your podcast app]