James Conard announces over on his blog that our team has just released the Windows Server 2008 Developer Training Kit for Beta 3. Mosey on over and check it out. You can find resources on everything from WCF, to Cardspace, to WF, to Windows Eventing, to PowerShell, to IIS 7, to Transactional NTFS.
So if you are a developer interested in checking out Windows Server 2008, make sure to grab it.