I have listened to the audio version of this book a few times. However, after a friend printed out and gave me a hard copy to read this past week I am deeply moved once again. I have read many books but this one, in approximately 55 pages, lays out clear direction for anyone traveling the path of enlightenment. If you have not read it yet I encourage you to do so. If you have read it before do so again, as I had listened to it before and apparently wasn't ready for the words.
Librivox.org has several of Allen's books in audio format.
librivox.org/newcatalog/search.php?title...ll&action=Search