Open Mat Radio is my favorite. Inside BJJ is better when Ernest isn't on (he tends to sidetrack the show w/too many masturbation jokes). Grappling Central isn't bad. The host can be a little dry and the audio quality can sometimes be rough but he gets a lot of good guests, stays on topic and tends to ask good questions.
Paul, the host of Open Mat has had some serious health issues over the last few years, so it's been a while since he did a show, but there's a pretty big back-log and even the older shows are still relevant. I've listened to his Danaher interview many times now and still get new things from it each time. I actually credit that podcast with getting me back into the BJJ and saving me from some very serious health problems of my own.