Windows PowerShell 1.0 Installation Package for Windows Vista

Windows PowerShell 1.0 is a new task-based command-line shell and scripting language that is designed specifically for system administration. Built on the .NET Framework, Windows PowerShell helps IT professionals and power users control and automate the administration of the Windows operating system and the applications that run on Windows.

By using Windows PowerShell, administrators can manage their systems by typing individual commands or running scripts that automate management tasks. Exchange Server 2007, System Center Operations Manager 2007, System Center Data Protection Manager V2, and System Center Virtual Machine Manager use Windows PowerShell to improve efficiency and productivity.

Link:
http://support.microsoft.com/?kbid=928439