PowerShell for Vista has shipped.
http://blogs.msdn.com/powershell/archive/2007/01/29/windows-powershell-1-0-for-windows-vista.aspx
Some links to go
A powershell cheatsheet
http://blogs.msdn.com/powershell/archive/2007/01/24/powershell-cheat-sheet.aspx
A VirtualLab for PowerShell (Learn by doing)
http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?culture=en-US&EventID=1032314395&EventCategory=3