Microsoft released the beta 3 version of this kit at http://www.microsoft.com/downloads/details.aspx?FamilyID=b36ee81a-aff5-4314-95d7-dad3acfa8094&DisplayLang=en.
Brief Description
The Windows Server 2008 Developer Training Kit includes a set of hands-on-labs and presentations for technologies such as IIS7, Management, WCF, WF, Windows CardSpace, Windows PowerShell, Virtualization and the Transactional File System (TxF).