Microsoft Remote Server Administration Tools for Windows Vista for x86-based Systems

http://www.microsoft.com/downloads/details.aspx?FamilyID=9ff6e897-23ce-4a36-b7fc-d52065de9960&DisplayLang=en

Microsoft Remote Server Administration Tools for Windows Vista for x64-based Systems

http://www.microsoft.com/downloads/details.aspx?FamilyID=d647a60b-63fd-4ac5-9243-bd3c497d2bc5&DisplayLang=en

This provides administrative tools, including GPMC, for Vista SP1.