I have yet to get into audio books, but a couple of my friends rave about how great they are, and how much they enjoy listening to them on their daily commute to work. I decided to look around for some online and came across a nice service that offers free audio books. Well, they are not free forever, but you do get your first 14 day membership trial for free. Has anyone tried Audible.com before? What do you think of their service?