Ted RAdio Hou
Radio Lab, and
The Nerdist. TED and Radio Lab are science-y rather than humanist.
The Nerdist ranges from atheism to entertainment to science; I pick and choose which to listen to based on guests I know are atheists or scientists.
Podcasts: Stuff You Should Know and RadioLab for sciency things. The Thinking Atheist, American Freethought, Ask An Atheist, The Atheist Experience, The Humanist Hour, The Scathing Atheists, and Cognitive Dissonance for secular themes although I also pick and choose since I can't listen to them all.