I downloaded a copy of this workflow package and did some tests with it, these guys are awsome.
PowerWF Studio for VMware is a suite of tools for automating and administering virtual machine operations and the guests within virtual machines. Leveraging the VMware's VIX API plus several other PowerWF activities packs, PowerWF Studio for VMware offers levels of automation typically only seen in enterprise class solutions. The product supports management of VMware Server, Workstation, Player, and Virtual Infrastructure (both ESX and vCenter).
The VIX activity pack furnishes building blocks that allow you to quickly develop complex workflows that automate virtual machine operations, as well as the guests within virtual machines. PowerWF supports all the functions available within VMware's VIX API with none of complexities. PowerWF protects your existing investments by giving you myriad ways to use your workflows, including within shell scripts, an existing .NET application, or integrated with PowerShell.
