Whaddya Know? Google Ad Manager provide tool to manage your online sales and inventory

Great to know that Google is now providing free ad manager just like having your own hosted open source ad manager (phpad). The service is still in beta and currently a free service to use. I'm hoping that they will offer this service free of charge after the beta stage. Here's a few words from Google Ad Manager.
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Google Ad Manager is a hosted ad management solution that can help you sell, schedule, deliver, and measure all of your directly-sold and network-based inventory.

• Simple, intuitive user interface: Decrease training time and trafficking steps with simplified tagging and inventory management.
• Google serving speed and reliability: Ensure quicker ad delivery and fewer reporting discrepancies.
• Significant cost savings! Pay no I.T. infrastructure, maintenance, or bandwidth costs.

Take a tour of Ad Manager:
https://www.google.com/admanager/login/en_US/tour.html

Try it now, you can use your existing adsense account: http://www.google.com/admanager