Make Google Adsense Ignore Text Outside of 2 Special Tags

At the 2009 WordCamp in San Francisco something about a Google Adsense tag was relvealed. You can wrap your post text around 2 tags so that all the Adsense ads on the website only take into consideration the text between those tags, and ignores everything outside those tags.

For instance, you can place the start tag above your post title:

<!-- google_ad_section_start -->

And the end tag at the end of the post, but above the related posts section or any other pieces of text you may have under the post:

<!-- google_ad_section_end -->

So that all the ads are based only on the post title and body.