Danged if we're not fast approaching the second Saturday of the month.
This means it's time for me to quote the Inside Adwords blog post that typically appears on the Wednesday before the second Saturday:
AdWords system maintenance on November 8th
On Saturday, November 8th, 2008 the AdWords system will be unavailable from approximately 10AM to 2PM PST, 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 10AM to 2PM PST.
We'll continue to update you via the blog as we always have, but please make note of the November 8th date and our scheduled maintenance further down the road.