As of writing this post (26 aug, 3:47 PST) i have checked several other blogs and none of them are displaying Google ads or just public service ads. There are no details as of yet about the outage but I would try to update this post as more details are available. If you encounter similar problem do let us know in the comments.
Update: Ads delivery has been restored and it seems like this outage lasted for 10-12 mins only. Earlier this year there was Adsense outage only for Blogspot hosted blogs which i guess lasted for few hours. However luckily this time it only lasted for few minutes.
I'm getting the same thing. I am going to a million other sites that usually have Adsense, too — all the same. Very strange! Been with Adsense since 2006, never seen this!
It's been restored as of writing this comment, luckily only lasted for few mins. :}