JQuery and ASP.Net

These tutorials cover the fundamentals of the jQuery library

• How jQuery Works by John Resig.
  A basic introduction to jQuery and the concepts that you need to know to use it.
  Tags: jQuery Core, Selectors, CSS, Traversing, Manipulation, Events, Effects

• Getting Started with jQuery by Jörn Zaefferer
  Goes through the basics of jQuery, all the way up to building plugins.
  Tags: jQuery Core, Selectors, Attributes, Traversing, Manipulation, Events, Effects, Ajax, Plugins

• Live Examples of jQuery by Cody Lindley
  An interactive demonstration of the basics behind jQuery.
  Tags: Selectors, Attributes, Traversing, Effects, Manipulation

Using JQuery for AJAX in ASP.NET

There is a nice article on codeproject that helps you to get started using JQuery in your ASP.Net application, though it is ASP.Net 1.1 based but can be upgraded to ASP.Net 2.0 easily using vs2005.

Evaluation of JavaScript Libraries

Here is a very good comparison/evaluation of 5 different Java script libraries.