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!)
http://www.microsoft.com/downloads/details.aspx?familyid=bbf2eb61-2b30-4f2d-bccd-df53e220b8e9&displaylang=en&tm
Documentation
http://www.microsoft.com/downloads/details.aspx?FamilyId=9893F83E-C8A5-4475-B025-66C6B38B46E3&displaylang=en
Homepage
https://www.microsoft.com/licensing/servicecenter/home.aspx?1033
Volume Activation 2.0 for Windows Vista and Windows Server 2008
http://technet.microsoft.com/en-us/library/bb892849.aspx
Volume Activation 2.0 Technical Guidance
http://www.microsoft.com/downloads/details.aspx?FamilyId=9893F83E-C8A5-4475-B025-66C6B38B46E3&displaylang=en
Windows Server 2003 SP1 KMS download (separate from Windows Server 2008)
http://www.microsoft.com/downloads/details.aspx?FamilyID=81d1cb89-13bd-4250-b624-2f8c57a1ae7b (x86)
http://www.microsoft.com/downloads/details.aspx?FamilyID=03fe69b2-6244-471c-80d2-b4171fb1d7a5 (x64)
Command line reference for the configuration VBS tool. (No GUI support I can find)
http://technet.microsoft.com/en-us/library/bb490217.aspx
Hope this helps.
Steve Schofield