Here are a few podcasts that I  have found very interesting lately:

"Hold Me Tight" on CBC's Ideas (Canadian Broadcasting Corporation).  An interview with author and couples' therapist Sue Johnson on attachment theory.  Her research explores the importance of primary relationships, especially parent and child attachment.

"The Brains of Babes" (part one) a three part series from the same program that looks into new research on brain development, human biology and behavior that shows the ways early experience can affect our health and well-being for the rest of our lives.   (I can upload parts two and three if anyone is interested)