I'm a terrible multitasker. Granted, research shows that almost no one is. None the less, my job entails some brute force drafting tasks that allow me to zone out, so I've been consuming a wide variety of podcasts. These are my favorites:
99% Invisible - stories about architecture and design.
You Are Not So Smart - a discussion of cognitive biases and heuristics.
Planet Money - economic reporting and storytelling.
Freakonomics - storytelling about counterintuitive research.
Dan Carlin's Hardcore History (Common Sense by him is pretty good too) - long, well researched historical content that focuses on wars.
The Truth - short fictional stories.
This American Life - investigative storytelling?