If you're into podcasts, you might not be able to find what interests you without relying on titles to search with — something that won't take you very far into the audio world. But Podzinger allows you to search within audio and video files on the internet, because it makes use of speech recognition software and indexes content of podcasts.
Weird thing is, it works.
I searched for “legal research” — as a phrase grouped by quote marks — and got back a whole raft of chatter wherein term occurs. And what's really neat is that it queue's up the audio to exactly the point at which your search term occurs and gives you in text some contextual material surrounding your search result.
This is very cool. Now if we could only get the Supreme Court to podcast oral arguments, we could make decent use of them with Podzinger.