Originally Posted by ProDigit
No, the audio books are just spoken books by a voice actor, with occasional background music. If they do display the text they'd have to be categorized as a movie file, as so far there is not yet a codec out there that streams audio and text together.
You could do this, by creating a movie file with only audio,and a null driver for video, while using subtitles though. To save space the subtitles would have to be an external subtitle file.
Actually AAX is a format available for audible books and it is not a movie file, However it will display still pictures synced to the text that is being read. It is perfect for children's books and is supported by audible reading programs. ePub 3 is also targeted at this capability although without readers to support the format it is hard to see exactly how it will work. You can download AZARDI reader for a pc and get some idea from its demo book.