Didier Sampaolo

Every Snippet can have tags and a format (which are custom taxonomies) attached to it. On display, the plugin will search for snippets with the same tag and/or format, and display one of them acccordingly. If multiple snippets are available, one of them will be randomly choosed on every page refresh.
You can use this plugin for your ads, but also for any HTML/Javascript/CSS code you wish to display on multiple pages.

wp Pause Ads

This plugin allows you to create HTML/CSS/JS Code Snippets and to embed them anywhere in your posts, using a shortcode.

amazingthemes

Victor TIN(mrdonrule)

Randomly and Customizable display of advertisements on single post page or category archive page by category (categories) or custom post types. Amazing Ads Manager includes all Google Adsense Display and Text Unit Sizes, Amazing Ads Manager recognises many ad networks including [Google Adsense].
Features Of Amazing Ads Manager:
<ul>
<li>Place ad using widget</li>
<li>In widget you can select to display ad randomly, Newest, Oldest, or specificaly by ID</li>
<li>Insert ad in single, page, or custom post using shortcode</li>
<li>Ad targeting by author, category, tag, page type, and much more</li>
<li>Auto-recognition for the most popular ad networks.</li>
<li>Add Single Image Ad on widget</li>
<li>Add Single Code Ad on widget</li>
<li>Auto Insert add to post/page/custom post content.</li>
<li>Randomly display add in single page</li>
</ul>
<h3>Licence</h3>
This plugin is released under the GPL – you can use it free of charge on your personal or commercial blog. Make sure to submit back to the project any changes that you make!

Amazing Ads Manager

Randomly and Customizable display of advertisements on single post page or category archive page by category (categories) or custom post types.

wp Pause Ads vs Amazing Ads Manager