Here’s a little gem I ran across (thanks to Cory) – a weekly podcast of original science fiction audio shorts called Escape Pod. They publish new stories about once or twice a week, each about half an hour long. All of their recordings are available from their website for direct download as MP3, or via any number of podcast systems.
All the stories I’ve listened to so far are quite good – and perfectly timed for my morning commute. Escape Pod apparently keeps quality up by having good editors and by actually paying the authors of the stories for the non-exclusive audio rights. What’s even more impressive is that Escape Pod then releases the stories under a CC license, which means you can share ’em with your friends as you like. And they support all this on donations alone.