I'm so happy to see American Library in Paris members joining the challenge. I had a conversation with a reader today about whether or not audiobooks "count" in such a challenge. I say they do. Personally I love the complementarity of listening and reading: recently, I read Greenblatt's Tyrant alongside the audio of Robert Caro's The Power Broker, which are two studies of perversions of power. I highly recommend both.
American Library in Paris Annual Reading Challenge