I don't think playaways/books on cd/audiobooks count as "reading", because you're not reading, you're listening. There is no doubt that it's still a "valid" means of consuming media, and there's no reason why you can't equate it with listening to a podcast, the radio, or good old fashioned storytelling. You still have to follow the plot, someone is just reading it aloud for you - which is pretty cool if it's the author, or a really good narrator!