PowerShell v2 is available already in Windows 7 (and shortly in Win 2008 R2). A Release Candidate is now available for Vista\Windows 2008
https://connect.microsoft.com/windowsmanagement/Downloads
it is a combined packages contain PowerShell v2, WinRM 2.0 and BITS 4.0
All you need except .NET. You will need .NET 3.5 if you want to use out-gridview
XP and Win 2003 versions will follow
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