If they are not protected. stick them into garageband and export them as a big mp3 I think thats what you mean.
You should have only used one topic. but I forgive you.
Then you lose chapter information, so that's no good either.
If they're single files, just name them correctly (if they're not already) and give them track numbers and "album information". That way, you'll have the book's title as the album title an the author as the artist. That'll work, no?
CJ: What's the other thread? If it's a separate question, two threads are more than okay.