Update 4: Google’s official statement was just blogged.
If you’ve tried to access your Gmail account today, you are probably aware by now that we’re having some problems. Shortly after 10 9:30am GMT our monitoring systems alerted us that Gmail consumer and businesses accounts worldwide could not get access to their email.Trouble In The Clouds: Gmail Turns Into Gfail | TechCrunch
2/24/2009Google Apps Help
Many of our users had difficulty accessing Gmail today. This also affected Google Apps users. The problem is now resolved and users have had access restored. We know how important the Google Apps Email is to our customers, so we take issues like this very seriously, and we apologize for the inconvenience.