I don't do books on tape. I used to when I had to drive 30+ minutes a day, but now my trips top out at 10 so it isn't worth it to me.
I have a blackberry bold with an ebook reader program. I simply download the ebook of the books I want to read and that way my book is always with me, and I always have a book light
I've ready over 100+ books this way in the past 2 years.