In the upcoming version of VMware ESX, the are a lot of new methods available in the SDK. One of the new methods is CreateScreenshot_Task which is part of the ManagedObjectReference:VirtualMachine. This method creates a screenshot of the 
virtual machine console, the image is saved as a portable network graphics (.png) file in the virtual machine folder. I created a little PowerShell script to initiate the screenshot.
Get-PSSnapin -registered | Add-PSSnapin -passthru -ErrorAction SilentlyContinue
$Server = Connect-VIServer -Server 192.168.178.250 -User Administrator -Password vmware
$vm = Get-VM -name "DC.NTPRO.LOCAL"
$vmView = $vm | Get-View
$vmView.CreateScreenshot_Task()
