[private joker]

Psychologists and education experts have shown that people's comprehension *vastly* improves by reading information as opposed to listening to it. This is why lectures are far less efficient means of learning that textbook reading or active learning. The same is true of fictional books. By reading the text, you engage more with both the language and the story, and you can go at your own pace. Listening to a book on CD will be either frustratingly slow or annoyingly fast (when you miss a story point and can't easily go back).

So yeah, I think audio books are for the supremely lazy and will never be as satisfying or illuminating as poring over the words themselves.