Podcasts = joy.
heartily agree with This American Life. The America you don't see on Fox.
http://www.thisamericanlife.org
Filmspotting is a great film review podcast from Chicago. Sans snark, multo passion.
http://www.flmspotting.net
Johnaton Goldstein either will or won't be your thing, but if droll whimsy lights your night, Wiretap's the go.
http://www.cbc.ca/wiretap/
IRC is a great improv teaching and students resource. Sometimes, the interviewees come across as tools, but the insights on improv are consistantly solid.
http://www.improvresourcecenter.com
The Flint Podcast is the greatest thing in the history of everything. *
http://www.theflintpodcast.com
It's about improv. An hour with one person. Randy Dixon, Patti Stiles, Dan O'Connor, P'Graph, and if skype muscles up, a furry lil' Texan called Crouch will soon be broo-hah-hahing about Live Nude Improv.
* Author may be producer of said podcast.