We have been covering Google Ad Manager since its launch and also since we started using it. The biggest complaint from shoemoney readers was that they could not get accepted into the beta.
Well its now open to everyone who has a Adsense account.
From the Adsense blog:
Now we’re excited to bring those benefits to all publishers. If you have an AdSense account, you can sign in to Ad Manager today. If not, apply for an AdSense account now. A Google AdSense account is a technical requirement for creating an Ad Manager account.
Google Ad manager is pretty awesome. I highly recommend you give it a whirl.