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Some of my favorites:
- This American Life (from PBS)
- Buzz Out Loud (a tech show which can be a little annoying)
- TWIT (a great tech show hosted by Leo Laporte)
- Net@Nite (another tech show hosted by Laporte)
- and one I just stumbled upon over the last couple of days: Well Told Tales - I've listened to two of the 15 minute horror short stories and they are freakishly great.