Hacker News Reader

Here's my list:

Side Hustle School

Art of Charm

NPR Marketplace

Parent Savers

Radical Personal Finance

Intelligence Squared

Intelligence Squared US Debates

HBR Ideacast

Happier

Serial

Slate Money

Common Sense

NPR Politics

Hardcore History

Freakonomics

Stuff You Should Know

99% Invisible

Planet Money

I'd add in:

Stuff you missed in history class - Various events from history, covering a wide range of events, small and large.

Make me smart - Kai Ryssdal and Molly Wood covering current affairs in the economy, tech and culture.

I've heard the plugs for Stuff you missed in history class, and the first episode of Make me smart...

...but I'm about 2 months behind in my feed as it is.