Thanks for the info, another cunning plan from Google.
I was looking for an ad management solution a while ago and it took me ages to find a free one. I settled on PHPAdsNew which has really good functionality but requires intallation on your server. I'd guess that Google's solution just involves cutting and pasting some javascript, and presumably once you start using it there's not-so-subliminal messaging convincing you how great asdense is
EDIT: Temi I don't suppose you have an invite? Wouldn't mind giving this a try