Bikescape - San Francisco Based Bicycle Advocacy News
KBOO Bike Show - Bike Issues affecting Portland OR
Velonews Audio Podcast - Racing news
Penn Future - Combating sprawl and environmental issues in Pennsylvania
NBG Mountain Mover's Podcast - National Bicycle Greenway Podcasts. Nice array of interviews
One thing that podcasts have helped done is push some bicycle themed music, like the tunes below.
Portland's Wandering Mind Society - "Pedal and Roam Theme song for KBOO Bike Show. Song has a DeadPhish feel to it.
Ryan Harvey -Riding my Bike to Work in the Rain - Nice upbeat acoustic tune
Funner than cars - Sung by Chicago Bicycle Federation Guru Randy Neufeld and Friends
Lists of other Bicycle Inspired Music
Bicycle Songs - http://bicycleuniverse.info
And two good songs that might fit into your soundtrack for a bicycle themed event. Each has little to do with bicycling
Saloon - Bicycle Thieves - Great title, retro-shoegaze/dreampop music
Orbit Bicycle Song - Edgy Alternative Rock worth the 99 cents for the legal download.