I've heard that when TV started spreading people thought it would never overtake radio. "Who has time to just sit and watch something?" You can listen to audio while you do other things. Podcasting is probably my main "media" for the last 5 or so years. I listen to 15-20 hours per week as I commute, exercise, wash dishes… Right now. As a marginal, unprofitable, poorly understood medium podcasts are amazingly "free."…
Any recommendations? I'm loving Serial, I listened to nearly all of it today. Occasionally I listen to Startups For the Rest of Us ( http://www.startupsfortherestofus.com/ ) but it's hit and miss if the content is relevant for me. Hardcore History is excellent. It'd be nice to discover some more.
You'd probably like "Criminal" which is short crime-related stories. Only a few have been produced, but they've been picked up by the Radiotopia folks to do more and more often.
"WTF with Marc Maron" has some amazing interviews with people from the comedy and music worlds, along with short monologues from Marc's twisted mind. The (pay-for) archives are where the best episodes are (Judd Apatow, Louis CK, Ira Glass, Ken Jeong, Ed Helms, Dick Van Dyke, Mel Brooks, Dave Foley, Dave Grohl, Aubrey Plaza, Bryan Cranston, the list is endless) but the most recent 50 are always free. His interview of Robin Williams was incredible, and he just reposted it in the free stream recently.
Also on my playlist: 99% Invisible (stories about the design of things (more interesting than that sounds)), Good Job Brain! (pubquiz-themed trivia show), Ask Me Another (live trivia show), The Memory Palace (extremely rare, but fantastically interesting episodes), Born Yesterday (interesting tidbits from history), The Bugle (John Oliver riffs with a comic colleague from England), StartUp (Alex Blumberg recounts starting his own podcasting company after leaving This American Life), and of course This American Life and Radiolab (if you can stand the style).
Also, check out the big list of podcasts the new label Wolfpop just put out. Lots of good pop-culture stuff: Nate Corddry Reading Aloud, Denzel Washington is the Greatest Actor of All Time Period, The Canon (histrionic arguments about movies), and Maltin on Movies (calm discussions about movies) are the ones I'm trying at the moment.
Podcasts my family enjoys but I've had to cut mainly just for time: Planet Money (NPR/TAL-style explainers about the economy) and the Sporkful (good-natured arguments about the minutiae of various foods).
NPR has a ton of great, well-produced podcasts and radio-shows-made-into-podcasts: Pop Culture Happy Hour, Dinner Party Download, Wait Wait Don't Tell Me, Fresh Air.
Hope that gives you a good starting point.
EDIT: some other podcasts I've listened to but given up for various reasons, but which are definitely worth checking out: The Moth, RISK, Snap Judgment, On Being, Life of the Law (I think).