A standardized system where a machine can mash/recombined pieces of audio once released.

so, a person can drop 2 minutes newsreading on 'washington politics' then another guy do 3 minutes of 'washington gossip from the street' they both dump it on the net.

then an automatic aggregator/editor will just mix them up to listener specification.

Right now, it's either you download the entire podcast somebody make or you don't download. It's the whole show or nothing.  And there aren't that many people can fill 30 min-45 min of talking. (who wants to waste that much time anyway?)