webdeveloper.com
Resources to teach you how to add Javascript to your pages, write Javascript code, or download ready-to-use Javascript source files.

scriptsearch.com
Scripts, source code, books, examples, help, and more. Covers Javascript as well as PHP, Perl, XML, and several other scripting/programming languages.

javascript.com
Javascript tutorials and free Javascript code.

Javascript Kit
Javascript, DHTML, CSS tutorials and over 400 free javascripts.

Dynamic Drive
Free, original DHTML scripts and components to enhance your web site.

Doc Javascript
Tutorials, tips, and tools from the experts at webreference.com.