Remember when looking for examples use examples from 2 or more sites if you are not sure the code is cross browser compatible.
General Javascript
http://www.w3schools.com/ - Javascript examples (not as cross-browser friendly as others)http://hscripts.com/tutorials/javascript/index.php submitted by kvijayhari
http://www.howtocreate.co.uk/
http://www.quirksmode.org/
http://www.artima.com/weblogs/viewpo...?thread=193593 (Hybridizing Java)
http://www.devguru.com/technologies/javascript/ - methods and properties (submitted by: merseyside)
Mozilla Developer Center - Fantastic reference, usually notes where methods or properties are proprietary vs. standard.
Javascript Toolbox - reusable libraries and scripts.
Performance Rules - interesting notes for speeding up your webapps
http://www.matts411.com - General Javascript
Form Validation
Form Validation - doing it rightForm validation (Apple)
Regular Expressions in Javascript (useful for form validation)
AJAX
AJAX:Getting Started (Mozilla Developer Center)http://www.xul.fr/en-xml-ajax.html (GET, POST, text and XML examples)
Jibbering
W3Schools AJAX Tutorial
Captain's AJAX Form Post/Get
AJAX for N00bs
Ajax Patterns - Has a very 'work in progress' feel to it, but an excellent resources for intermediate-to-advanced level AJAX programmers.
Frameworks
Prototype - An excellent framework for all levels of JavaScript programmers. Includes advanced DOM functions and AJAX encapsulation.Script.aculo.us - Advanced effects and controls for JavaScript. Even if you're not a programmer, it's a fun site to visit!
DHTML Goodies - Can't vouch for 'em, 'cause I've never used 'em, but they work pretty well in my browser, and they've got some really advanced stuff in here.
Ajax Toolbox - tools for Ajax. A library rather than a framework.
Google Web Toolkit - Build AJAX apps in the Java language
JQuery - a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development
ExtJs - very mature application framework (mainly) for backoffice applications, the 'killer-feature' for that is the most advanced grid-component in ExtJs
DoJo - good framework to speed up webdevelopment - has nice plugins and is well thought out
MooTools - small framework that even has nice plugins - if you want to build a custom app-framework for websites and want to build it upon a fast and nice base - check it out