Google AdWords The AdWords account interface is temporarily unavailable due to system maintenance. AdWords is expected to be down from approximately 10:00 AM until 2:00 PM PST [?] on January 10, 2009. Please note that your campaigns will be running normally during this short period of downtime, which only affects your account management pages. We apologise for any inconvenience.
Its handy that they tend to do it all at the same time, adwords, adsense, keyword tool... So its done and all back to normal quickly, its better than adwords down one day, adsense down 5 days later etc