2007-06-06 release of the AJAX Control Toolkit has a number of fixes identified as important by the community including designer support for Tabs and Web Services. It also has Animation support for some extenders, event support across the Toolkit, a Script combiner for reducing Toolkit scripts' download time, Dynamic context support for controls using Web Services, fixes to make ASP.NET Validators work with Toolkit extenders, Accessibility improvements and much more.
http://www.codeplex.com/AtlasControlToolkit/Release/ProjectReleases.aspx?ReleaseId=1813