I'm with you, todd. Radiolab fucking sucks. I listened to many annoying episodes hoping to hear what people liked about it. Stupid editing, stupid jokes, very little actual "science."
The best science program I've ever head is CBC's Quirks and Quarks, which has a podcast.
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Librivox is better than most podcasts can hope to be.
I periodically subscribe and unsubscribe to NPR's Shuffle and most emailed stories podcasts, which I hope to be a "Best of NPR." A lot of drek seeps in, though, especially NPR's profiles of various generically awful musicians.
The BBC's Global News podcast is a good 1/2 hour of information. Its "NewsPod" is more focused on British news, test match results and that kind of thing.
I wish I liked ESPN's Baseball Today more. They just focus on baseball from a very insidery perspective that's too much for me.