Doctor Mike's podcasts are a wonderful source of info. He keeps even complicated subjects understandable for average people. The shows tend to have an easy-going feel, perfect for those who are anxious at the doctors' office. As an added bonus, he takes questions from email and Skype so you can get (non-emergency) questions answered.
Dr. Mike is a doctor at Nationwide Children's Hospital, which is consistently ranked as one of the top children's hospitals every year. As a parent whose child has been seen in both the NCH emergency department and neurology department, I can say I have never seen a doctor there that wasn't great. Therefore, if Nationwide Children's Hospital calls Dr. Mike one of their own, I trust his judgement.
I would highly recommend this podcast (and do so to all my friends and family) for anyone who has interaction with kids. Parents, grandparents, teachers, daycare workers, medical professionals, etc.