I listen to a couple of bike podcasts, and one that I really like is bikescape, by San Francisco's Jon Winston. He covers lots of different aspects of bike culture, not only in San Francisco but around the country. He's done 'casts about pedicabs in New York, Critical Mass, and his latest podcast is about musician Attila Horvath, who hails from Athens, Ohio.
Horvath's music is fun, lyrically clever, and almost all about bikes! It's available on iTunes so check it out. And listen to bikescape, too... you'll learn something new about bikes!