Listen to your pod casts on your bicycle just like you do when running or waiting on queues.

If you wish to expand your horizons beyond podcasts, I suggest you go to your local library and find out about which Audio products are for loan. Audio books for download to mp3 players, or old fangled CDs and cassette tapes work just fine when cycling. My local library has thousands available in tape and CDs, and thousands more available (including latest best sellers) for download through Overdrive.
The list of books I've listened to while cycling (all for free) over the last several years is at: http://www.bikeforums.net/showthread...1#post15022152