Use ToolkitScriptManager instead of ScriptManager

Shawn Burke’s Blog: Updated Toolkit Release Now Available

Other neat stuff

News about new AJAX

Installing AJAX Toolkit for Visual Studio .NET 2005

Script combining made easy [Overview of the AJAX Control Toolkit’s ToolkitScriptManager]

Batch JavaScript Libraries for Increased Performance

Combining, Compressing, Minifying ASP.Net ScriptResource and HTML Markups

Using the ASP.NET AJAX Client Library without a ScriptManager

.NET 3.5 SP1 Doesn’t Provide Composite Script Registration from an IScriptControl (out-of-the-box)
webCast on ScriptCombining

While using Toolscriptmanager:
The encoding information is missing in the response content of .js files