There are two really great youtube channels that offer free episodes of Coast to Coast AM. Coast to Coast AM is a radio station concentrating in interviews with pioneering figures specializing in frontier science, the paranormal, ufology--- just about anything you can think.  Unlike many of the radio shows and podcasts out there, these shows are done by professional interviewers on quality equipment. Stop by and check out some of the shows:

http://www.youtube.com/user/theduderinok
http://www.youtube.com/user/SetYouFreee

Enjoy!