Get-VMHost | Select-Object Name,@{Name=”NTPServer”;Expression={$_ | Get-VMHostNtpServer}}, @{Name=”NTPRunning”;Expression={($_ | Get-VMHostService | Where-Object {$_.key -eq “ntpd”}).Running}} | Sort-Object -Property “NTPRunning”, “NTPServer”

I used this to generate a report and added some extra script to fix incorrect settings (also works to change NTP server setting) as well as restart NTPD service if it has stopped.

I have the full script available at:
http://day2dayadmin.blogspot.com/2009/10/ntp-powershell-its-about-time.html

and on the PowerCLI VMware community.

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