Google Drive is currently experiencing issues worldwide. It went down just before 11 a.m. Eastern, and the cause seems to be that "The server is not responding."
Google is calling this a "minor service interruption, giving this description thus far:
Curiously, this comes less than two days after Apple announced their Google Drive competitor, iCloud Drive, at WWDC. Perhaps something is amiss in Silicon Valley. We'll keep you posted on the status of the outage.
Update: Google Drive is okay again. Phew.