PowerShell workflows
Just as remoting was viewed as the biggest gain in PowerShell v2 it looks like PowerShell workflows will be one of the biggest features on PowerShell v3.
Some examples and explanation are available from http://blogs.msdn.com/b/powershell/archive/2011/12/22/another-holiday-gift-from-the-powershell-team-powershell-3-0-ctp2-getting-started-with-windows-powershell-workflow.aspx
Enjoy