Interesting news on The WindowsServer Team blog :
As we’re getting closer to release, Windows SharePoint Services 3.0 is returning to how it was previously available to Windows Server 2008 customers. Specifically, we are going back to making it available as a separate download that is available to customers at no additional charge. This is how Windows SharePoint Services was available to Windows Server 2003 customers (pre-R2). With the beta and RC0 versions of Windows Server 2008, we offered it in the Windows Server 2008 software. Starting with RC1 and going forward, Windows SharePoint Services 3.0 will have to be downloaded separately. Basically, we made this decision to allow customers to most conveniently obtain the technology while allowing Microsoft to have flexibility in the Windows SharePoint Services development process. If you have not looked at WSS 3.0, be sure to download it and peek around. It offers great collaboration, social computing and document management features and provides a rich composite application development platform based on our .NET technologies. The SharePoint team is working hard on great new features and releases that customers will continue to see delivered via download. For more guidance re: installation/evaluation updates, see: http://download.microsoft.com/download/b/9/e/b9e27997-7a8e-493c-b23b-58eeaa3214c8/WSSGuide.doc.