Update 2: Here's Google's response, though it's in the context of this being a Gmail outage, when it was pretty clearly an across-the-board service disruption:
On Monday, 10 December 2012, we experienced an issue with Gmail and some users experienced slow performance or errors. For everyone who was affected, we apologize - we know you count on Google to work for you, and we worked hard to restore normal operation for you. Although our engineering team is still fully engaged on investigation, we are confident we have established the root cause of the event and corrected it. Our current best estimate is that a significant subset of users' Gmail web queries were affected for an aggregate of 18 minutes, from ~08:54 - ~09:00 and then from ~09:04 - ~09:16 Pacific Time.