After posting to Twitter, a number of Gmail users also reported problems.
We are tracking the situation and we will update the post as we learn more. The Google Apps Status Dashboard doesn’t show any issues at this point.
A number of cloud computing services have suffered outages in recent weeks. Both Google and Microsoft reported problems earlier this month.
UPDATE 11:45 a.m.: I was able to get back into Gmail, but we will keep monitoring this throughout the day. It appears that the outage lasted about 10 to 15 minutes.