There are a lot of moments in the day where I'm listening to audiobooks: commute to work, running, train, etc. I usually like fiction, but it's hard to do that during these moments so I've turned to non-fiction. I've burned through a lot of evolution stuff from Richard Dawkins, religious stuff from Dawkins, Harris and Hitchens so I don't really need something in that vain at this time.
Currently listening to Superfreakonomics and got Guns, Germs and Steel (why eurasian civilizations were able to survive and conquer others) and The World Without Us (got this from the ebore thread and found the premise incredibly interesting) in the waiting line.
It can be about anything: investigative journalism, politics, history, science. It just needs to be interesting (=well told/written) and give me insight.
Also don't just mention titles, give the premise and if possible your opinion.