If you like this Ned, then you might like these. I'm not sure if they are available as podcasts, but you can listen to them because they are archived on the "Listen Again" section of BBC Radio Four, which is similar to NPR in the US.
Frontiers: Peter Evans explores new ideas in science, meeting researchers who challenge existing theories and their critics.
Most recent: Climate change
Leading Edge: Discoveries, debates, hot topics and news reports from the world of science. Presented by Geoff Watts.
Most recent: Wet weather, Pterosaurs, students uncover clues in mass grave, Leonardo's great lady
The Material World: Quentin Cooper and his live studio guests discuss the latest scientific investigations and research findings.
Most recent: Nobel Prize for Medicine, The Peppered Moth