Finished Tom Clancy’s Red Rabbit on CD->MP3->iPod a few days ago. Nice book. I’m a big fan now of books on CD. Knocked out one (abridged) novel in just a few evenings.
One perhaps oft-overlooked benefit of books on CD: You can “read” them in the dark, so your significant other doesn’t have to stay up with you and you don’t have to read in the living room.