I use Audible quiet a bit. It's great for when you're doing repetitive tasks like mowing, causal biking, walking, know by heart work @ work, driving and so on. They're having a special right now $6.95 for the first three months. It's a good deal and definitely worth the $21.
You can listen on smartphone, PC, laptop and probably a couple other devices I don't use.
The 2 best books I've listened to so far are:
Can't Hurt Me -
LINK - Despite the cover it has very little to do with the military. It's an autobiography of a man overcoming adversity to become a real life super hero. Incredible, motivational story.
Born to Run -
LINK - This one kind of depends on whether or not you're a Bruce Springsteen fan. I had no idea the mountain that guy had to climb to get where he's at today. Very cool story.
1 credit is usually $14.95 so that's a good deal they're spinning. I just canceled and renewed through that deal. If you don't like the format for some reason you can cancel after 1 month and only be out $6.95.