The original JavaScript documentation is found at Netscape's Web site (since mostly moved to mozilla.org), but there's a lot of good information at sites from Microsoft and independent JavaScript pages. Here are some of the best JavaScript Web sites that we've found.

Netscape/Mozilla/Firefox:

Core JavaScript Guide

Core JavaScript Reference

Using Web Standards in Your Web Pages

Venkman, the Mozilla JS debugger

Microsoft:

MSDN Library: Scripting

Official MS IE Blog

Yahoo:

Yahoo! UI Library

Yahoo! JavaScript Developer Center

Yahoo! Design Pattern Library

Yahoo! Developer Network: Graded Browser Support

Elsewhere:

PPK's Quirks Mode resource site

Web Standards Project/DOM Scripting Task Force

Blogs:

DOM Scripting: The Blog

Dean Edwards's weblog

QuirksBlog

Ajaxian

Yahoo! User Interface Blog

Yahoo! Developer Network blog

Apple Safari Team Blog