We've discussed this topic off and on as people have requested recommendations, but never dedicated a thread to it to keep those recommendations handy.  So which books did you find particularly good in the audio format?  I'll list a couple to start us off:

The Flavia de Luce series by Alan Bradley and read by Jayne Entwhistle

I saw a recommendation for Doc by Maria Dora Russell

What others stand out to you?

Good idea, Christa!  I second the Flavia books.  Also, I thought the Outlander series was well done.

Robert McCammon's Matthew Corbett series: Speaks the Nightbird, etc.; Warlord by Angus Donald; Ruth Downie's Medicus series and of course, Doc and the Flavia de Luce books!

The narrator (Ballerini) for the Robert McCammon series is excellent and I see he is narrating Blood and Beauty - The Borgias by Sarah Dunant. It isn't released yet but I'm thinking about checking this out since he did such a good job on the others.

Imogen Robertson's, Westerman and Crowther series, they changed narrators after the first book, and for books 2 and 3 had a different but equally good narrator. Imogen tells me that they have a 4th narrator for the next book in the series, a man, I am withholding judgement on this.

Sara Donti's Into the Wilderness series.

I second the Outlander series and the Matthew Corbett series.

I also like listening to SKP's Lionheart, mainly for the pronunciations of the arabic and french words.  In fact that is why I originally purchased the Outlander books on audio was for the pronunciation of the Gaelic that was beyond me.

Here's my list, although some are not strictly HF.

11/22/63
The Painted Veil
Outlander (I did not like the story, but the narration is superb.  If the basic story is your cup of tea then go for it!)
The Thirteenth Tale
A Tree Grows in Brooklyn
The Kitchen House
The Help (absolutely the best)
Water for Elephants
The Snow Child

I could go on and on. Jeanne turned me on to audio about 2 years ago. Now I can't get in my car without one.  I developed some large floaters in my eye which are very annoying when I read. I am very thankful for audiobooks.

Right now I'm working on "The Storyteller" by Jodi Picoult. Love it! There are multiple readers, which helps with characterization. There are occasional odd pauses here and there in the narration, which are a little strange, but on the whole, this is an extremely compelling audio. I've added some extra treadmill time here and there because I didn't want to stop - I had to keep going a little bit longer, to see what happens next. I love this book so far - it is on my WL, and I will keep it there because I'd love to have a hard copy of this for my WWII keeper bookcase.

Yes, Simon Vance....His reading of Louis Bayard's The Black Tower is brilliant.

I also love Katherine Kellgren's audio versions of the Bloody Jack series by L.A. Meyer.

I strongly endorse previous recommendations for the audio versions of Doc by Russell and the Flavia de Luce series by Bradley.

I have to check my list so I may be back with more.

The Guernsey Literary and Potato Peel Pie Society.