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.

clippersoft

The mySimpleAds WordPress Ad Manager allows you to easily place your mySimpleAds Ads inside your wordpress posts, pages, or even right in your templates.
Please Note: This requires mySimpleAds from <a href="http://www.clippersoft.net/" title="ClipperSoft's mySimpleAds" rel="nofollow ugc">ClipperSoft</a>.
To use …
Posts/Pages: 
Place [msa_aid=x] for an Ad ID or [msa_gid=x] for an Ad Group ID in your post, where ‘x’ is the Ad or Ad Group ID. 
You can also optionally specify the type of ad code to use – (p) PHP Remote Read, (j) Javascript Injection, (a) Ajax Javascript, like: 
[msa_gid=x,c=a] for Ajax Javascript. If you do not specify, it will use PHP Remote Read by default.
Templates: 
Place msa_show_ad_id($aid,$code); for an Ad ID or msa_show_group_id($gid,$code); for an Ad Group ID in your template PHP code (you may need to surround the function by PHP tags, if it’s outside an existing PHP tag section). The $aid is the Ad ID, the $gid is the Ad Group ID, and $code is type type of ad code to use – ‘p’ PHP Remote Read, ‘j’ Javascript Injection, ‘a’ Ajax Javascript. It defaults to PHP Remote Read.

mySimpleAds WordPress Ad Manager

The wordpress plugin will allow you to easily place your mySimpleAds Ads anywhere into posts, pages, or templates.

wp Pause Ads vs mySimpleAds WordPress Ad Manager