Here is some links on Volume Licensing 2.0. If you are going to implement Windows Server 2008 into your environment. Plan on spending a couple of days understanding the concepts. Note, the KMS stuff is built into Windows Server 2008, so you don’t have to add it like you did in Windows Server 2003.
Windows Server 2008 KMS Setup Demonstration video (I suggest starting here!)
Volume Activation 2.0 for Windows Vista and Windows Server 2008
Volume Activation 2.0 Technical Guidance
Windows Server 2003 SP1 KMS download (separate from Windows Server 2008)
Command line reference for the configuration VBS tool. (No GUI support I can find)
Hope this helps.