The world’s best radio, on your time- I like the sound of that! PublicRadioFeeds.com has a ton of feeds to all the public radio stations that publish their audio so you can subscribe to it. The science feeds are my favs of course- Dr. Karl, Quirks and Quarks, Talk of the Nation Science Friday, The Science Show, This week in Science and new one called Hack I am going to check out. Lots of great stuff. Link.
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Also useful: Public Radio Fan
It gives the times and URLs for the streams so you have to use something like Streamripper to get them as files.
-ben