I'm still thinking about recording a podcast from within SL, but haven't quite done it yet. I even have my Hiber-Nation Theatre space set up for exactly that. My original idea was to get a group together and record everybody live via SL's own Voice Chat mechanism. But since I've had no visitors to speak of, I haven't seen the point. Not yet, anyway. The flipside is that if I'm -not- doing shows, why would anybody be showing up?
I'm a little hesitant to think anyone would want to come just to hear me. On the other hand, a few hundred have come to hear the Podiobooks versions of some of my books, so I suppose I must be doing something right.