" Clicking between different sites would be quite disruptive. What would be much better, from my selfish point of view, would be for the audio to remain under control of the producers, but for the various constituent parts to be aggregated and arranged into a coherent whole *in a single place* where I can draw down a single assembled instance … like the Anchor output."

Thanks Ian, I agree with that completely. Anchor helps with listening in the car, as it moves, in some cases, to the next wave automatically. I like to get my audio set up to play before I set off and would not like to click and drive at the same time. I do think some sort of aggregation combined with web mentions/trackbacks could be made to work with elegance. I guess the problem would be who would pay for that.