For your information. ASP.Net team has recently released the first preview of the ASP.NET AJAX 4.0 on CodePlex.

URL: http://www.codeplex.com/aspnet/Release/ProjectReleases.aspx?ReleaseId=15511

This release contains a preview version of the following features:

Client-side template rendering

Declarative instantiation of behaviors and controls

DataView control

Markup extensions

Bindings

The goal of this release is to give some visibility into our design process, allow testing of the technology very early in the product cycle and get feedback on the implementation.

My new tutorial on gadget development is published on Kidoos.

Here is the link: http://kidoos.net/content/WinVistaGadget.aspx

Understanding Their Rationale and How to Make Them Work for You

Look at five features of Windows Vista that are often misunderstood, learn about their background and rationale, and get the straight scoop on how to deal with them.

User Account Control

Image management

Display Driver Model

Search

64 bit architecture

You can download and read from here