Google launched a free hosted service on Thursday that helps Web site publishers manage advertising slots on their site.
Ad Manager, like similar paid management services, can target ads at specific users. It can deliver ads depending on a user’s domain, Web browser, the PC’s operating system and bandwidth.
A site not using Google’s Adsense ads can also use the Ad manager. The Ad manager can be configured to fill in the unsold slots with Adsense ads if the site owner wants.
Overall, a useful tool. Let’s see how successful it is and how Google plans to make money from it. My gut feeling is that the next step will be a “friendly” message asking users to share their data anonymously if they want to use advanced features (remember the message on Google Analytics!).