It's time to be a journalist. I wish I wasn't waiting for a plane in Atlanta. It appears that Personal Audio LLC is suing individual podasters for patent infringement. Personal Audio LLC (often known as a patent troll) won a settlement where they were awarded $8 million dollars from Apple in 2011. That seemed to be about playlists.
On January 7th Civil Action No. 2:13-cv-00014; Adam Corolla's company Ace Broadcasting is being sued over “System for disseminating media content representing episodes in a serialized sequence” patent 8,112,504
On the same day a similar patent was filed against Howstuffworks.com
In looking at the documentation it seems to be more about the player.