I like Audible for non-fiction/pop-sci books as well as fiction.
In September we drove to Germany and listened to Mythos, written and narrated by Stephen Fry, which was an interesting mix of the two.
I also listen to a lot of podcasts and Malcolm Gladwell's new book 'Talking to Strangers' blurs the lines between the two.
Gladwell is famous for popularising the '10,000 hours rule' and he gets a fair amount of flack for being less than scientific in the way he presents his research. However, if you read his books for entertainment rather than as objective non-fiction, he does have some interesting theories and anecdotes.
He has a podcast series called 'Revisionist History' where he "goes back and reinterprets something from the past: an event, a person, an idea. Something overlooked. Something misunderstood." It's well worth a listen because it's interesting, it's free and it will let you decide whether you like his voice/style before buying anything.
Most of the non-fiction audiobooks I've listened to are narrated by the author (with varying degrees of success) but they are just reading the text as it's written. In 'Talking to Strangers', Gladwell approaches the audio more like his podcast. When he refers to a historical moment (like a televised speech), he will get the audio from that moment, rather than him just reading out the words. If he has interviewed someone, he will use clips of the interview rather than reading out 'their parts'. He also uses music and sound effects — it makes the whole experience more engaging.
I'd like to think that this could be a new approach to audiobooks but it obviously requires a lot of planning up-front, with the intention of doing it this way from the outset. I think the next Freakonomics book could be done this way, given how good they are on the podcast side of things.
Laughing thinking about it now, he achieves legendary status from it. The legend follows him everywhere and he just wants to curl up and be left to die from embarrassment