www.googleadservicescom is a site that uses a security certificate to encrypt data during transmission, but its certificate expired on 3/5/2008 10:52AM. You should check to make sure that your computers time is correct.
Google is definitely screwing around with security things. I click logout of adwords and it logs me out and then back in. Started seeing this yesterday. Seeing odd stuff with Gmail too. You have to love how much they DON'T want you logging out :)
I have had this problem for 2 to 3 months. I use google.com/adwords to get to the Adwords login. I consistantly get warnings about the security certificates being invalid. I just ignore the warnings... Interesting to see this come up though.
