There's no way I can choose just five. I'm pretty sure I've listened to every one of them. Probably my all-time favorite was the Doyald Young interview.
Heller + Vienne
Bantjes + Gelman + Surtees (partially because of a remark made in passing that gave me an idea for a book I want to write; no, it's not about you guys but… well, you'll see)