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martingale - 8:11 pm on Feb 10, 2007 (gmt 0)
Maybe Adsense is down for maintenance too for the same period of time but the Adsense folks didn't bother posting the helpful message that Adwords did.
If you try the Adwords site (adwords.google.com) it is also down, but in that case, it says for a maintenance window that runs from 10AM to 2PM PST.