I've been listening to the 1950s sci-fi radio program, X Minus 1. It's pretty fun so far. I've listened to about half of the second episode (the first episode was 404'd). I heard about it on the Engadget podcast. It's set in 1987 on board a spaceship headed for another solar system. Five ships have been lost trying to make this trip, but the captain thinks he can do it. If you're offended by bad language, then watch out. The salty old spaceship captain does at one point say st***d id**t.

Update: I should also link to the main site, RadioLovers.com. There are lots of cool programs like Abbott & Costello, Amos & Andy, Avenger, Batman, Buck Rodgers, Calling All Cars, etc. And it's all free.