Beyond IF authors being guests on gaming podcasts from time to time, there are a bunch of interactive fiction podcasts cropping up:
Clash of the Type-Ins: rcveeder.net/clash/
Inklecast: feeds.soundcloud.com/users/sound … sounds.rss
Radio K: adamcadre.ac/audio/
The first two are on iTunes. The last one is not, as far as I know, so you need to download the episodes and then upload them to wherever you listen to podcasts.
Any others?