Escape Pod  http://escapepod.org/podcast.xml
Escape Pod Classic http://feeds.escapepod.org/EscapePodClassic
StarShipSofa Science Fiction Audio Podcast  http://www.starshipsofa.com/rss
Pseudopod http://feeds.pseudopod.org/Pseudopod
Come Let Me Whisper  http://feeds.feedburner.com/rlburt
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Drabblecast  http://feeds.feedburner.com/TheDrabblecast
Activated Stories" type="rss" xmlUrl="http://activated.libsyn.com/rss
Planet Retcon Dot Com  http://planetretcon.com/podcast/feed.xml
Spider on the Web  http://www.spiderrobinson.com/iTunes_feed.xml
Central Audio Theatre  http://feeds.feedburner.com/centralaudio
The Seanachai Episodes  http://www.theseanachai.com/category/episodes/feed
Break Room Stories  http://feeds.feedburner.com/BreakRoomStories
Texas Radio Theatre Company  http://texasradio.libsyn.com/rss
Decoder Ring Theatre   http://decoderring.libsyn.com/rss
The Hell Hole Tavern  http://www.btpodshow.com/feeds/hellholetavern.xml
Afterlives   http://www.afterlives.net/afterlives.xml
GraphicAudio  http://feeds.feedburner.com/graphicaudio
dickdynamo's Podcast  http://dickdynamo.libsyn.com/rss
Voices Of Tomorrow   http://voicesoftomorrow.libsyn.com/rss
Cossmass Productions - Rebels of the Red Planet  http://feeds.feedburner.com/cossmass/rebelsredplanet
Cossmass Productions - Estalvins Legacy   http://cossmass.co.uk/series/estalvinslegacy/feed
Second Shift An original fantasy Podplay (web-quality audio version)   http://secondshiftpodcast.com/xml/2shift.xml
Pendant Productions - The Dixie Stenberg and Brassy Battalion Adventure Theater   http://www.pendantaudio.com/dixie-podcast.xml
Pendant Productions - Indiana Jones and the Well of Life   http://www.pendantaudio.com/indy-podcast.xml
Pendant Productions - Once Upon a Time in Vegas   http://www.pendantaudio.com/vegas-podcast.xml
Podiobooks.com (with many, many excellent audiobooks)  http://www.podiobooks.com/