I've been reading up on Longhorn and Core Server.  This is a scaled down non GUI windows version.  It is intended for such roles as DNS, DHCP, Domain Controller.  These infrastructure services are critical in keeping a Windows environment up and running.  Here are a few links I found that were interesting.

• http://blogs.technet.com/server_core/archive/2007/01/05/server-core-changes-in-the-december-build.aspx
• http://www.windowsnetworking.com/articles_tutorials/Creating-core-Longhorn-server.html
• http://www.msblog.org/?p=715
• http://forums.microsoft.com/TechNet/ShowForum.aspx?ForumID=582&SiteID=17