There's an excellent radio show about marketing called The Brand Show that airs in Kansas City but is also available via podcast. It is both content rich and entertaining with many useful segments. They have a great segment called "This Week in Branding History" which includes really interesting trivia that you can impress your peers with. They also discuss industry news, relevant topics, trends, and interview insightful guests. The hosts are very knowledgeable and contribute insightful commentary while having fun too.