It seems to be fixed -- and fast too:
Kelly Machado Google Employee 9:38 AM (1 hour ago)
Thank you all for your reports! Just to let you know that we are currently looking into this.
We will keep you updated on this thread.
Kelly Machado Google Employee 10:35 AM (48 minutes ago)
We think we've fixed it. Could you please try and refresh your browser (clear cache & cookies) and see if it worked for you?
Some folks suggest that you need to refresh your DNS settings, though.
I never got to see it...