I was just coming on to post this same question and share ones that I know of.
It has been a long time since I listened to a Bass guitar oriented podcast but I decided to search for one on iTunes tonight and stumbled on the following:
https://itunes.apple.com/us/podcast/...279590508?mt=2 Bassbooks.com podcasts and has been updated monthly for the last 5 years running!
This seems to be the only ongoing Bass podcast so make sure you give it some love and feedback to boost their prominence on iTunes!
