Indexing - Seanan McGuire, Mary Robinette Kowal, Brilliance Audio
It could easily be argued that I've said enough (if not too much) about Indexing. So I'm not going to talk about the story, the writing, and so on, beyond this: not listening to this episodically like I read it, highlights strengths and weaknesses. For example, it's minor, but the way she has to re-introduce the cast in every episode gets pretty tiring when you hear them all minutes apart -- but you don't really notice at all when you read them every 2 weeks.
The book as a whole is developed better and more fully than I realized initially -- the whole thing is a lot more connected than I realized. I'd been intending to kick back and read the whole thing sometime to see how it held together, and I'm glad I got the chance to with the audiobook. It's really a much stronger whole than I realized.
The main thing I want to talk about is Mary Robinette Kowal (that's three audiobooks in a row from her, I have to take a break before I just assume that every audiobook is by her). She was fantastic. Her Sloane wasn't anything like the Sloane in my head, but far superior. The rest of the team was spot on -- but the best was Henry. The little inflections of her voice when Henry was closest to her Story, when she was at her most Snow White-ness, added so much to McGuire's words. I really couldn't believe how much more I got out of it through her interpretation of the character.  Just outstanding.
If you haven't read the stories or book yet, I do recommend them -- but if you get the chance, go with the audio instead. A recommendation I never thought I'd say about any book and audiobook.