First released in March as a limited beta, Google Ad Manager is now available to anyone that has an AdSense account. According to Google’s blog, Ad Manager…
can help you sell, schedule, deliver, and measure both directly-sold and network-based inventory. It offers an intuitive and simple user interface, Google serving speed and reliability, and significant cost savings. Best of all, Ad Manager can be optionally integrated with Google AdSense to offer you an automated way to maximize the revenue of your unsold and network-managed inventory.
If you sell ads on your site, or run ads from more than one company, this is likely to be a very useful tool.
I’m just getting my feet wet with it, so I can’t say much from personal experience. How about you? Have you tried it yet? What did you think of it?