
Testable JavaScript - Trostler [1]
Both fairly recent and for the most part, useful.
[0] - http://www.amazon.com/Maintainable-JavaScript-Nicholas-C-Zak...
[1] - http://www.amazon.com/Testable-JavaScript-Mark-Ethan-Trostle...
@raganwald I hope you plan to write other JS books as well, you're one of the most original && intelligent authors out there.