Something to check out, info stolen from wikipedia
Perhaps the most notable new feature of Windows Server 2008 is a new variation of installation called Server Core. Server Core is a significantly scaled-back installation where no Windows Explorer shell is installed, and all configuration and maintenance is done entirely through command line interface windows, or by connecting to the machine remotely using Microsoft Management Console. Server Core also does not include the .NET Framework, Internet Explorer or many other features not related to core server features. A Server Core machine can be configured for several basic roles: Domain controller/Active Directory Domain Services, ADLDS (ADAM), DNS Server, DHCP Server, file server, print server, Windows Media Server, Terminal Services Easy Print, TS Remote Programs, and TS Gateway, IIS 7 web server and Windows Server Virtualization virtual server. This last role is projected to be available at most 180 days after release of Windows Server 2008.
Setup reference
Server role reference