At Brad Feld's recommendation, I checked out Spousonomics: Using Economics to Master Love, Marriage, and Dirty Dishes by Paula Szuchman and Jenny Anderson. As someone who's taken econ classes in high school and college, I was skeptical about the book and thought its applications would be pretty cheesy. It's true that some of the applications (like around game theory) were a bit contrived, I found that most everything else was sensible and actually useful to real life and real relationships.
The book was overall really well written with a witty voice and lots of little jokes spread throughout that made me happy as a reader. I enjoyed reading stories about the relationships of professional couples (and people married to economists!), and I enjoyed reading that many of the issues I've been facing are not uncommon. I got some practical advice on small, incremental hacks and fixes (at the margin!), which I enjoyed, and I liked seeing that many of it goes counter to "traditional" advice. It was also fun to get a light-hearted refresher of all the basic econ topics and hear about how Nobel prize-winning economists deal with issues in their own marriages.
Below are my notes on the book.