I'm a Powershell fan (a recovering LogParser junkie - check out this mighty fine mix from MS.COM operations) and am delighted that the team has delivered their V2 CTP for public consumption. All the standard caveats for CTPs apply. More on the Powershell blog:

The Community Technology Preview (CTP) of Windows PowerShell 2.0
http://blogs.msdn.com/powershell/archive/2007/11/06/the-community-technology-preview-ctp-of-windows-powershell-2-0.aspx

What's New in CTP of PowerShell 2.0
http://blogs.msdn.com/powershell/archive/2007/11/06/what-s-new-in-ctp-of-powershell-2-0.aspx

GUI, remoting or hosting apis, hmmm? What do you like?

Update from the readme:

Supported Platforms:

This release of Windows PowerShell installs on x86 and x64 platforms of Windows XP-SP2, Windows Server 2003-SP2, Windows Vista, Windows Vista-SP1, and Windows Server 2008