On transit, and going to sleep at night I listen to 'podcasts'.
On transit, I like mentally stimulating and current events related information, so:
-WTF Podcast - interviews of artists
-Canadaland - the Canadian media and political landscape
-Radiolab - interesting stories from WNYC south of the border, basically a more interesting CBC
At night, I listen to old time radio shows which lull me to sleep. There are too many shows to mention, but I like mystery, suspense, sci-fi.
I introduced 'A Logic Named Joe' here on another thread:
http://canadianpoliticalevents.createaforum.com/general-discussion/google-culture/I'd be interested if someone gave that a listen....