Javascript tools.

[Duha]

Intaractive course:
http://www.codecademy.com/tracks/javascript

Editor:
Sublime Text 2 (syntax highlighting, smart autocompleate, crossplatform, free) if any moders/developers use it I can add API functions to autocompleate.

Sandbox:
Place where you can execute some code that is not related to wz api (very useful for beginners).
Where are many in web. I use console of firebug (firefox plugin).

Readable:
http://shamansir.github.com/JavaScript-Garden/en/