Windows PowerShell, formerly known as Monad is a new command-line shell and task-based scripting technology that provides comprehensive control and automation of system administration tasks. Windows PowerShell allows Windows administrators to be more productive by providing numerous system administration utilities, consistent syntax, and improved navigation of common management data such as the registry or Windows Management Instrumentation (WMI). Windows PowerShell also includes a scripting language which enables comprehensive automation of Windows system administration tasks. The Windows PowerShell language is intuitive and supports existing scripting investments. Exchange Server 2007 and System Center Operations Manager 2007 will be built on Windows PowerShell.

Official PowerShell Website

TechNet resources on the new PowerShell ScriptCenter

PowerShell Blog

PowerShell News Group

Download the refreshed Windows PowerShell RC1