Microsoft has releaseed the Remote Server Administration Tools (RSAT) for Vista SP1. RSAT enables IT administrators to remotely manage roles and features in Windows Server 2008 from a computer running Windows Vista with SP1. It includes support for remote management of computers running either a Server Core installation or the full installation option of Windows Server 2008. It provides similar functionality to Windows Server 2003 Administration Tools Pack.

You can find RSAT here.