[edw519]

I would start with the Rhino book

http://www.amazon.com/JavaScript-Definitive-Guide-David-Flan...

[dgabriel]

I could not agree more.

The web has lots of practical examples and API documentation, but it's fragmented information. This book gives you a thorough, cohesive understanding of the language.

[morbidkk]

I had rhino book but things got better when I read

http://www.amazon.com/Professional-JavaScript-Developers-Wro...