I am listening to The Girl who Played with Fire, the second in the Stieg Larsson trilogy. I'm actually enjoying it more than The Girl with the Dragon Tattoo, as it is a better mystery IMHO, with more interesting plot twists. It does have a little too much violence and sex for my tastes, but I look forward to car trips to hear more.
I started reading My Antonia by Willa Cather last week, but haven't made it past the second page (very busy . . . which is why I like audio books, I can listen to them when I'm stuck in the car not able to do anything else). I'm trying to read lots of classic books that I never read before. I scoured the library book sale a few weeks ago and bought several . . . I'll see how long it takes me to get through them.