During commutes and chores. Mostly really geeky tech podcast. Computer Security, embedded systems, networking. Twit.tv, packetpushers.net, theamphour.com embedded.fm, unnamedre.com. www.cbc.ca/radio/spark. Grazed through dozen more worldsgreatestcon.fireside.fm www.redhat.com/en/command-line-heroes(a season or 2 behind). Audio books don't really do it form me. All of the podcast I listen to have RSS feeds. Don't use podcast services