Audiobook suggestions?

As I said last week, I'm working on shedding a few pounds. I think I'm doing a bit better on the food side. However, the exercise side is much more difficult for me. I don't have room in my house for fitness equipment, though I would really like to have a home gym one day. So I guess I'm left with just walking around town a few days a week. It gets really boring though. I did hear a suggestions about listening to audiobooks while walking. I'll have to look around to see if I can find any good ones. Suggestions?