Microsoft's ad management interface has been down for the past hour. Via the adCenter blog:
We are currently conducting maintenance on the adCenter user interface.
The user interface will be unavailable for the next couple hours. Rest
assured, your campaigns and keywords will run as usual. However, you
will be unable to make changes using the user interface. Advertisers
who access the system using the API will experience no issue managing
campaigns. We are sorry for the inconvenience and appreciate your
patience while maintenance is being performed.
Maybe they are working to impliment the their new Google Analytics killer - Gatinuea