Some of the ones I listen to:
Binnal of America
http://binnallofamerica.com (for archive click on “AUDIO” at the top of his page)
USA. Approximately fortnightly in seasons. One to two hours long. Host is Tim Binnall. Not a very probing presenter, but does cover a fairly wide range of what he calls “esoterica”.
Guests have included Gary McKinnon, Richard Dolan, Nick Redfern, Loren Coleman, Peter Davenport, Walter Bosley, Jim Marrs, Phil Imbrogno, Nick Redfern, Greg Bishop.
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The Unexplained
http://theunexplained.tv
UK. About monthly. Approximately one hour long. Host is Howard Hughes. Covers a wide range of the paranormal. Hughes is a professional radio broadcaster and takes an impartial position even when presenting guests advocating the most bizarre theories.
Guests have included David Icke, Dr Edgar Mitchell, Jacky Newcomb, Nick Pope, Linda Moulton Howe, Heather Cooper, Richard C Hoagland, Jacky Newcomb, Timothy Good.
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Skeptoid
USA. Weekly. 10 to 15 minutes long. Host is Brian Dunning. The show’s strapline is “Critical analysis of pop phenomena”. Dunning thoroughly researches various claimed “paranormal” events and reveals more prosaic causes, although his critics claim he only selects the easily debunked cases. Nevertheless, I think he injects some common sense and a rational perspective into the subject. If you don’t want to hear an alternative viewpoint then don’t listen.
Subjects examined include HAARP Myths, The Scole Experiment, Apocalypse 2012, The Real Philadelphia Experiment, The Battle of Los Angeles, The Antikythera Mechanism, Aliens in Roswell. Dunning occasionally has feedback programmes where he corrects his errors pointed out by listeners.
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Project Camelot and Project Avalon
USA. Irregularly produced. Often over two hours long and most interviews are also available as video downloads. Hosts are Bill Ryan and Kerry Cassidy. “What Camelot is about is the investigation into the mysteries that surround us.” The websites are very extensive with forums, blogs, etc.
I’m really not sure what to make of this team. They have their detractors who claim they are either part of the “disinformation programme” or just publicity seekers. But Rayan and Cassidy appear committed and genuine. Not usually very probing in their interviewing technique, especially Kerry Cassidy who seems to believe everything she hears. Podcasts cover a wide range of subjects including various government conspiracies, spirituality and aliens.
Guests have included Bob Dean, David Icke, Richard Dolan, Jim Humble, Jim Marrs, Steven Greer, Dolores Cannon. A noteworthy recent interview on the Project Avalon website was between Bill Ryan and “Charles” which has provoked much comment on various “alternative media” forums. This is either an elaborate hoax or confirms much of what conspiracy theorists have said all along… (But I think it’s a hoax.)
More recent (and controversial) interviews are those with John Kettler ("washed-up unmovable boxes are alien probes") and Bill Wood aka Bill Brockbrader... (Now, that's a total of six hours of my life I won't get back!)
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The Moore Show
UK. Weekly. About an hour long. Sponsored by UFO Matrix Magazine. Host is Kevin Moore and makes the programme for Sky. He’s no heavy-weight interviewer, but has a wide range of guests including Derek Acorah, Timothy Good, Richard C Hogland, Nick Pope.