I want to thank Colorado Springs Utilities for unexpectedly cutting our power for routine maintenance.
When trying to power our VM's back on, we got two different odd errors on separate ESX 4.0.0 hosts, both with the same resolution.
"An error occurred while communicating with the remote host."
"Detected an invalid snapshot configuration."
Both of which had us concerned about data corruption to say the least, however we restarted the VMW management service and they both came back to life.
service mgmt-vmware restart