"The InvokePowerShellCommand activity can be used to run the PowerShell commands or script files within a build without using then generic InvokeProcess activity to run the PowerShell interpreter. In this example we aim to show the basic steps that are required to get the activity integrated into a build.
Before you can make use of any of the TFS 2010 community build activities you have to make sure they are available for the build system and on your development PC. Instructions for this process can be found in the ALM Rangers build guide or in the StyleCop page of this wiki. This page assumes the InvokePowerShellCommand activity is available in the developers build process workflow toolbox.
Using the activity with an inline script
Using the activity with an .PS1 file from source control
This looks like a cool way of extending, customizing, etc, your Build process. I mean, it's PowerShell! :)