There have been a number of reviews of Windows Server 2008 since we made the RTM 3 weeks ago (doesn't time fly ).
The latest comes from Paul Thurrott's super site for Windows where he puts the product through its paces.
There he lists his top features as Componentization with a purpose, Server Manager, Server Core, BitLocker Full-Drive Encryption, Read-Only Domain Controller, Internet Information Services 7, Terminal Services, Network Access Protection, Windows Firewall, Command line and scripting goodness and Hyper-V.
I would love for ITPRO's to think a little about the .NET Framework too. Version 3 is available as part of the Application Server role. This is really important as you start to layout your computer architecture for your business applications.