jQuery Primer

Introduction

If you've never really learned JavaScript, the short tutorial at JavaScript Tutorial is all you need to get started.

Use

<script type="text/javascript" src="jquery-1.4.2.js"></script>

Resources

Alternatives to jQuery

Books

jQuery Cookbook: Solutions & Examples for jQuery Developers by Cody Lindley
Ajax: The Definitive Guide by Anthony T. Holdener III
Building a Web Site with Ajax: Visual QuickProject Guide by Larry Ullman
AJAX and PHP: Building Modern Web Applications 2nd Edition by Bogdan Brinzarea & Cristian Darie
jQuery in Action, Second Edition by Bear Bibeault and Yehuda Katz

Sites