Eloquent JavaScript
Marijn Haverbeke
http://www.amazon.com/Eloquent-JavaScript-Modern-Introduction-Programming/dp/1593272820
JavaScript: The Good Parts
Douglas Crockford
http://www.amazon.com/JavaScript-Good-Parts-Douglas-Crockford/dp/0596517742
Secrets of the JavaScript Ninja
John Resig
http://www.amazon.com/Secrets-JavaScript-Ninja-John-Resig/dp/193398869X
JavaScript Patterns
Stoyan Stefanov
http://www.amazon.com/JavaScript-Patterns-Stoyan-Stefanov/dp/0596806752
High Performance JavaScript
Nicholas C. Zakas
http://www.amazon.com/Performance-JavaScript-Faster-Application-Interfaces/dp/059680279X
Stunning CSS3
Zoe Mickley Gillenwater
http://www.amazon.com/Stunning-CSS3-project-based-latest-Voices/dp/0321722132
Responsive Web Design
Ethan Marcotte
http://www.abookapart.com/products/responsive-web-design
Bulletproof Web Design
Dan Cederholm
http://www.amazon.com/Bulletproof-Web-Design-flexibility-protecting/dp/0321509021
Handcrafted CSS
Dan Cederholm and Ethan Marcotte
http://www.amazon.com/Handcrafted-CSS-More-Bulletproof-Design/dp/0321643380