Not just me but multiple other folks have seen it at different times. Read 1, 2, 3, 4, and many others.
How can such a service be a down ? May be that’s why they are still in BETA.
UPDATE: Yet again, GMail was down for 12 hours on Mar 1, 2007. The timing of this new GMail promotional video seems to be ironical 
Technorati: Google Gmail Error
gmail does not make me proud
Comment by Jose Villeta — March 2, 2007 @ 11:08 am
Am searching for jobs and gave gmail as my primary point of contact. The server is down today and I dont know when it’ll come up again. Even POP servers are not working.
Comment by JobSeeker — March 27, 2007 @ 1:48 pm