My ALWAYS playlist in Overcast:

- 99% Invisible - The Changelog * - Dan Carlin's Hardcore History * - EconPop Podcast - Engineers & Coffee - Freakonomics Radio * - The James Altucher Show - The Joe Rogan Experience - The Journal by Kevin Rose - Planet Money * - Radiolab - Reply All * - Revisionist History * - This American Life - The Tim Ferriss Show * - The Way I Heard It with Mike Rowe * - The Winning Agenda

I will delete episodes with uninteresting starts or guests, most notably on Rogan because it's so long-form. I listen to everything on 2x speed with "SmartSpeed" to also eliminate pauses. Threw an asterisk next to those that are the most significant for me. If I were to pick just one, it would be Tim Ferriss.