HOW TO: Implement Remote Scripting or AJAX using ASP.NET 1.1

Involves the use of Javascript, CSS, and XMLHTTP (at least most of the time) to provide rich interactive user experience in a web application:

Implementing Remote Calling Without Using AJAX by Rajesh Toleti (15seconds.com) - using hidden IFRAME; does not rely on XMLHttpRequest object.
ASP.NET: Remote Scripting, Yes! AJAX, "NOT!" by Peter A. Bromberg (EggHeadCafe.com)
Implementing AJAX using ASP.NET 1.1 by Ian Suttle (15seconds.com)
Using AJAX with ASP.NET by Bipin Joshi (DotNetBips.com)
AJAX, RemoteScripting.NET, Script Callbacks and Other Goodness by Peter A. Bromberg (EggHeadCafe.com) - using Jason Diamond's AJAX.NET library
Implementing AJAX in ASP.NET by Karl Seguin (Developer Fusion) - using Michael Schwarz's Ajax.NET library.
ASP.NET Spiced: AJAX by Karl Seguin (MSDN) - Using Michael Schwarz's Ajax.NET library.
Remote Scripting by Alvaro Mendez (The Code Project) - using Javascript Remote Scripting (JSRS) library; also supports Microsoft Remote Scripting (MSRS) clients.