A little outside the box but Vet Tech Cafe is great because it really highlights the different options for technicians too, and they have a lot of VTS guests which really opens one's eyes to the possibilities for technician retention (I think it's valuable for veterinarians to acknowledge what technicians are capable of contributing).
Internal Medicine for Vet Techs is great, the hematology series helped me with my tech boards.
Veterinary Anesthesia Nerds is run by a well known VTS in anesthesia and she brings on VTS, DVMs and boarded specialists to talk about cases.
The Uncharted Veterinary Podcast is good. VETgirl, Veterinary ECC Small Talk also.