If you are and you are looking for someway to listen to them even on your ipods, here's some help for you..
Making Your Own Audio books for iPods
If you have audio books on CD, you can rip them to use in iTunes and on your iPod. To get the most out of these audio books, you need to choose a format for importing, join any tracks on the CD, and make the files bookmark able. We look here at all three of these actions.
1. Choosing a format for importing.
2. Join tracks and import your CD.
3. Make the Files Bookmark able.
For detailed step by step guidance for these procedures, you could visit www.audioinfo4u.com/Making_Your_Own_Audio_books_for_iPods.htm
After you’ve done this, your audio books are ready to sync to your iPod. You can set up play lists for them, or just leave them in your library as they are. It’s a good idea to check their genre to make sure they say Audio book or Spoken Word so it’s easy to find them. (You can change the genre by selecting a file or files, then selecting File > Get Info, clicking the Info tab and choosing a genre from the Genre popup menu.)
Listening to Audio books on your iPod
When you sync audio books to your iPod, they show up in one of two places. If your files are bookmark able, as discussed above, they appear in the Music > Audio books menu automatically, even if their genre is not Audio books. They also appear by genre, artist or “song”. If they are not bookmark able files, you’ll have to search for them from these latter menus.
You play audio books on the iPod like any other type of audio file, but audio books (again, bookmark able files), give you an extra option: go to the iPod’s Settings menu and select Audio books; this lets you choose a different speed for the playback. You can choose Faster or Slower if you want to change the speed of a droll or hyper reader; this plays the file back at a different speed, without changing the voice. You’ll notice some distortion, but in most cases this is not a problem.
You can also make this change as you’re listening to an audio book. After it starts playing, press the Select button three times. Run your finger around the scroll wheel clockwise to change the speed to Faster; scroll the other way to return to Normal, or to change to Slower.
voxpopuli

Thanks for the nice link. Jai Hind.