Microsoft Hyper-V Server 2008 is out. Read about Hyper-V Server here: http://www.microsoft.com/servers/hyper-v-server/default.mspx.
One of the differences between Hyper-V on Windows Server 2008 core, and Microsoft Hyper-V Server 2008 is that Hyper-V Server comes with a set of scripts that make setup easier from the command line. These scripts are collectively called HVCONFIG and makes the setup experience look like this:
as opposed to this:
which some people find easier for that first POC/I-want-to-kick-the-tires install. Most enterprises will use automated installs, but still, for getting to know this FREE (as in beer) new virtualization product, HVCONFIG is helpful.
There is no supported way to take the scripts from the free download of Microsoft Hyper-V Server, and use it on a server core installation of Windows Server 2008 to install and configure Hyper-V, but I have heard it works just fine. Of course, if your purpose is to test/proof-of-concept - why wouldn't you use the Microsoft Hyper-V Sever instead of server core? I did mention it is FREE-as-in-beer, right? And there is no activation step in setup - not required - because Microsoft Hyper-V Server is FREE:-)
Microsoft Hyper-V Server 2008 Configuration Guide will provide you with all the information you need to setup and configure Hyper-V Server 2008. It covers setup up local administrator passwords, the new Hyper-V configuration tool (HVCONFIG) and remote management: http://www.microsoft.com/downloads/details.aspx?FamilyId=E1E111C9-FA69-4B4D-8963-1DD87804C04F
To learn more about the FREE Microsoft Hyper-V Server take a look at the Edge video: First Look: Hyper-V Server.