OpenGlobal Random Ad Inserter
This is a clever plugin for the Joomla CMS that randomly inserts your Google Adsense or YPN code into your articles. After you install the plugin, just enter your ad code (or any code at all, it doesn't have to be an ad) into the text box, set the number of times you want it randomly inserted into each article and tell it which articles and pages you want to exclude. Once the plugin is enabled it will randomly insert the code into your articles between paragraphs.
This plugin is based on the same concept as the Adsense and YPN Inserter plugin but has been completely rewritten by somebody who can actually program. It uses a fraction of the code, provides much more flexibility and doesn't break W3C compliance for no apparent reason.
You can download the plugin for free.