It's 5.30pm GMT and I've just tried to log into my account and was greeted with the following message: 'We’re building a better adCenter! Access to your account is temporarily unavailable while we perform scheduled adCenter maintenance. All your ad campaigns will continue to run normally during this process, and you should be able to sign in to your account again 02:00 GMT on Sunday, March 13, 2011. We apologize for the inconvenience and appreciate your patience.'
If it was 'scheduled' then why on earth don't they give their customers some notice about this? I might need to make some essential changes and I'm completely stuck - VERY VERY BAD ADCENTER!