You have probably noticed that many websites tend to display advertising between posts, surrounded by relevant content.

Achieving this in Drupal is a trivial task. All you need to do is place the following code to the top of the node.tpl.php for whatever theme you are running.

If you are using custom_content and customizing it differently using a node-custom_content.tpl.php, don't forget to add the code to the node-custom_content.tpl.php as well.

This will add the adsense code after the 2nd and 4th post. You may want to adjust this accordingly.