I've never seen this page before..
Have you guys?

Is it new or something? :/

http://www.google.com/ads_by_google.html

(oh, and i know what is it for.. if some of you wonder.. :P)

Hmm, when you click on "Ads by Google" part of an ad (please don't try here, thanks! :)) it will forward you to services.google.com/feedback/abg?somethingSomething, but when you remove the parameters it will redirect you to above page...

So you haven't seen it either Philipp?