On Saturday, July 19th, 2008 the AdWords system will be unavailable from approximately 10 a.m. to 3 p.m. PDT, for maintenance. While you won't be able to sign in to your accounts during this time, your campaigns will continue to run as usual.
AdWords system maintenance typically occurs on the second Saturday of each month from 10 a.m. to 2 p.m. PDT, with this week being an exception.
We'll continue to update you via the blog as we always have, but please make note of the July 19th date and our scheduled maintenance further down the road.