NPR used to publish a "most emailed stories" podcast in iTunes, however in January 2015 the feed stopped.
This script cobbles together similar collection of stories. Rather than the most emailed stories, it uses the NPR Popular stories page view. The script uses BeautifulSoup to import the page view and save audio stories and their related metadata in a sqlite database. It then downloads the audio file for each story and joins them together into a single audio file of the most popular stories for each day.
Finally, the script exports a RSS feed called podcast.xml to consume.