Target Content for Adsense Ads

Have you ever notice that your advertisements for your adsense program are irrelevant to your contents? The ads are associated to some unrelated keywords in your site, such as "blog", rather than the main content of your site. Google has introduced a tag to solve this problem.

Add:
<!-- google_ad_section_start -->
Your contents
<!-- google_ad_section_end -->

Please note that you might need to have include a significant amount of content in the tag to make it work properly. And, allow some time for google's crawler to come to your site before you can see the differences.

Read what Google said here.