Introducing third-party ads on the Google content network :

The Google content network now accepts display ads served from qualified third-party vendors. Third-party ad serving has been a long standing request from top brand AdWords advertisers who use third parties to create and manage their online campaigns. Initially adsense is accepting third-party ads in English, but they hope other languages also soon.

Making the Google content network more accessible to large brand advertisers also benefits AdSense publishers and end users. Third-party ad serving will introduce a great variety of advertising into the Google content network, increase the inventory of quality display ads competing to show on AdSense publisher sites, and offer more engaging ads for end users. In the long run, the increased inventory and ad competition will result in increased revenue for many Adsense Publishers.

Rest assured that ad quality on the content network will remain one of AdSense highest priorities. Only advertisers with whom Adsense proven relationships and who have clearly demonstrated commitments to AdSense quality standards may participate in this program. And Google AdSense policies governing ad content and formatting are unchanged.

Optimizing your site / blog to allow third party ads :

To allow third-party ads on your site...

1. Opt into image ads - Currently third-party ads are only available in image or flash, so they dont appear in text-only ad units.

2. Enable advertisers to target your AdSense channels - Most advertisers who use third-party ads are brand-conscious. They prefer to specify websites where thier ads will appear in order to optimize the targeting and effectiveness of their compaigns.

3. Opt into placement targeting - Placement targeting will allow advertisers to target their ads specifically to your site.

Following these steps will enable your site/blog to accept third party ads...