It seems like an understatement to just say that MDT 2010 now supports PowerShell to automate Deployment Workbench administrative tasks. Really, Deployment Workbench has been completely re-architected – all operations you perform through the UI
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Read the complete post at http://blogs.technet.com/mniehaus/archive/2009/07/10/mdt-2010-new-feature-16-powershell-support.aspx