Walkthrough: Creating And Using Ajax-Enabled Web Service

http://msdn.microsoft.com/en-us/library/bb532367(v=vs.90).aspx

 Getting Started with jQuery in Visual Studio 2008

http://blogs.microsoft.co.il/blogs/bursteg/archive/2009/06/05/getting-started-with-jquery-in-visual-studio-2008.aspx

 jQuery Examples

http://www.w3schools.com/jquery/jquery_examples.asp

 Ajax Control Toolkit

http://www.asp.net/ajaxlibrary/act.ashx