The ASP.NET Ajax Library on Codeplex
Yep, this library is open source. Visit the project site to download the latest build.
The official ASP.NET Wiki
An almost complete list of HOW TO's. Use this as a reference.
- ASP.NET 4 and Visual Studio 2010 Web Development Beta 2 Overview
- Client-side Data Binding in ASP.NET AJAX 4.0
- Databinding in ASP.NET AJAX 4.0
E-book: Building high performance web applications
Free e-book focusing on how to use the ASP.NET Ajax 4.0 library to improve the performance of your web applications. Download it for free.
- This download on Codeplex contains a bunch of example projects
- On the official Wiki you can also find two example applications
- Demos by Craig Shoemaker at the Los Angeles .NET User Group
- Infinities Loop