Looks like Google has added a new feature to its Google Ads: The ability to let you bid directly on a specific site with your own ad (see my own blog page on the top left - you get a new "advertise on this site" link).
Nice. So now you can tell Google that you'd like to spend up to X amount for 1000 page views etc on any given day. I'm starting to really get into this technology related issue of managing this complexity..