The SharePoint team released some details about the upcoming service pack. You will find in the SP1: Windows Server 2008 Support and Compatibility ASP.NET for AJAX Compatibility and Support Including Support for Web Parts Built with AJAX Control Toolkit for ASP.NET and AJAX 1.0 Extensions (941955) New STSAdm Commands 60+ Hotfixes Across WSS 3.0 SP1 / SharePoint Server 2007 SP1 Here you can read more about the upcoming release : http://blogs.msdn.com/sharepoint/archive/2007/11/29/preview-into-wss...