3rd-Party ads now available on the Google content network

Google has recently made a change that allows third party ads to be shown on their network. As per their blog post:

The Google content network now accepts display ads served from qualified third-party vendors. Third-party ad serving has been a longstanding request from top brand AdWords advertisers who use third parties to create and manage their online campaigns. Initially, we will be only accepting third-party ads in English, but we hope to expand to other languages soon.

You need to ensure that you have image ads enabled for your site to take advantage of this feature.