Essentially with this tool small businesses can optimize and manage their ad inventory and see how its performing. And it will display Google AdSense as a default for unsold ad space. It will track different types of advertising including: display, search, affiliate, rich media, and video advertising.
“Google Ad Manager is a free, hosted ad and inventory management tool that can help publishers sell, schedule, deliver and measure their directly-sold and network-based ad inventory. It offers an intuitive and simple user experience with Google speed and a tagging process … providing detailed inventory forecasts and tracking at a very granular level, Ad Manager helps publishers maximize their inventory sell-through rates.”
DoubleClick has the DoubleClick Revenue Center, which is for publishers with larger sales teams. Google says they’ll continue to support and enhance DoubleClick’s services. For now participating in the Google Ad Manager is by invitation only but you can request to be included.