Stephen recently announced a new AJAX Control Toolkit (Version 3.0.30930) on his blog

Here are some highlights of this release:

• Over 20 Bug fixes including some major fixes to the CollapsiblePanel, Calendar and Tabs controls
• Two new Controls which include a version of Seadragon and a new Asynchronous File Upload control. Seadragon allows zooming in and zooming out of images using your mouse whereas the Asynchronous File Upload control allows users to efficiently upload files without having to send the entire contents of the page back to the server.

You can download the Toolkit over here