ASP.NET AJAX 4.0 Preview 5

ASP.NET AJAX is a pure client-side JavaScript library that enables you to build Ajax applications that work with all modern web browsers. By taking advantage of ASP.NET AJAX client controls and templates, you can build database-driven web applications that execute entirely in the browser.
ASP.NET AJAX supports the following features:

Client templates that can be used to format database data in the browser
Client controls such as the DataView control
Client DataContext component that supports change tracking and identity management
ADO.NET Data Services support
WCF and ASMX Web service support
JSONP support
Observable pattern for plain JavaScript objects
Live Bindings
Command Bubbling
Support for managing complex links and associations between entities from multiple entity sets or tables

In Preview 5 of ASP.NET AJAX 4.0 we continue to improve the client-side data story introduced in previous previews of ASP.NET AJAX. In this release, we add support for the following features: