I have been trying recently to improve my English language skills, most prominently listening an speaking, so I thought I have to make use of the long wasted hours in transport to listen to some English. I searched the internet for 'audio books' and found the site www.booksshouldbefree.com allows users to download free uncopyrighted audio books from the public domain.
The next day, I was sitting with a group of IT geeks, one of them came across that audio books issue while talking, he said he had a huge number of gigabytes worth of Audi books on his iPhone and he listened to damn long hours of books on the go in his car.
I chatted with a friend, he guided me to a common friend who had 16 gigas of audio books, metaphorically "Eden of Audio Books' :)
I went to him and took some of which titles attracted me, and let me tell you audio books are such an experience!
I listened first to Morrie's tuesday and now I am listening to Paulo Coelho's Veronica Decides to Die.
Apart from improving my listening and pronunciation skills tremendously. it also added a while new spectrum of idioms and vocabulary to my lexicon, it also helped understand what intonation was like.
It's like watching a movie because the narrator tends to act dramatic or theatrical. One last advantage of audio books is you never waste a moment, always on the go, have your mp3 player loaded with your favorite books, play them when you are driving, riding public transport, waiting in a queue or even just relaxing.
While I don't recommend they substitute normal print book reading, they are just as useful especially when you can't hold a book or when you just need to close your eyes because you are tired or something.
I suggest you download free audio books from the public domain, you will enjoy :)