KEXP's song of the day RSS feed is awesome. So is MPR's The Current feed. I'd like to download these each day and add them to my iTunes library, and have them automatically pushed to my iPhone via iTunes Match.
Here's a simple script to fetch the RSS feed and save the files into a directory on your Mac. I then use Hazel to automatically add them to a specific playlist in my iTunes library.
You will need the excellent feedparser Python library. I use it in a virtualenv.