Microsoft published new guide about planning and design infrastructure in Windows Server 2008.
Main subject are:

System Center Operations Manager 2007
System Center Virtual Machine Manager 2008
Internet Information Services 7.0
NAP
Microsoft SoftGrid Application Virtualization
Windows Deployment Services
Windows Server 2008 Active Directory Domain Services
Windows Server 2008 Terminal Services
Windows Server Virtualization: Hyper-V and Virtual Server 2005 R2 SP1

For Windows Server 2003 I [...]