Well, read one and listen to one, on my iPhone. There's a nifty iPhone app called Stanza (with a matching screen reader from Lexcycle) that makes the device a perfectly credible ebook reader. So now I could read a book in Stanza while listening to one at the same time (or even, I suppose, listening to the same one).
Which, of course, I probably won't do, except maybe for a few minutes just to say I did, but it's not so unusual for me to listen to, say, a radio news program while scanning AP or Reuters headlines - a regular media orgy, you might say.