Hey jashkenas / Michael, how funny, we are just in the review process of our book (also at O'Reilly) covering functional programming techniques in JavaScript! It is in German, and with lots of tasty Curry recipes we explore currying in programming and cooking at the same time. :)
Our book is called "Das Curry-Buch" (the curry book) and you can find it here: http://is.gd/currybuch
Check it out, I think there cannot be enough books on functional programming! :)