A beginner’s guide for consuming a WCF service in JavaScript using ASP.NET AJAX

Great article and very well explained, it just works

http://www.codeproject.com/KB/aspnet/wcfinjavascript.aspx?msg=3433363

Great Javascript coding tools

Although there are many tools to avoid coding directly in javascript (GWT, WebSharper,Pyjamas...)
there are also many great tools which help developping 'clean' code in Javacsript, among of them :
(apart from JQuery of course, well the term 'clean' is perhaps less appropriate for it)

- Angular.js
- KnockOut.js
- Sammy.js
- Mochikit
- Mootools
- JS.Class

Give them an eye it really worth it