Google’s servers seems to have been down for a period of time this morning. Service has been restored, but it seems to have affected Gmail, Google Apps, and Google Voice, and some accounts (likely on certain virtual servers) and not others. No official word from Google yet on the outage, but I experienced it as did many of my clients.
UPDATE: Google appstatus site now indicates that there was a problem. All services now restored: www.google.com/appsstatus.