On the official page of the AJAX Control Toolkit project there is a new version of this set of controls. AJAX Control Toolkit is an open source project that offers ASP.NET developers dozens of server-side controls working with ajax requests.
The new May version of the AJAX Control Toolkit (Version 50508) has the following changes:
Improved operation of the ModalPopup control, added support for animations;
Improved the AsyncFileUpload control, added support for HTML5, fixed incorrect work in Firefox 4;
Improved the DropShadow control, added unit tests, fixed an error when working with UpdatePanel.
You can download binary components for ASP.NET 3.5 / 4.0 and the AJAX Control Toolkit source code at the following link . ')
A detailed description of the innovations can be obtained in this article .