Wordpress Text Link Ads
This plugin replaces select keywords with a url and a javascript tooltip containing the description of the link. How it differs from other plugins that are similar is that it pulls from the database all links in a predefined category. It does not use the fancy tooltips plugin, I found it to be over bloated for the needs of this plugin.
Compatibility
Javascript does need to be enabled in your users browser for the plugin to work, otherwise they will see just the link as normal, without the tooltip.
Download and installation
Download the plugin and unzip the entire contents to /wp-content/plugins/. You should end up with the following file:
/wp-content/plugins/wp-text-link-ads.php
To use this plugin just browse to the Plugins page in your WordPress Administration area, and activate the plugin.
Using Text Link Ads
Go to “Links » Link Category » Add a Link Category” in your Wordpress admin and create a new category like the example below:
The settings do not really matter, just name it something meaningful.
The next step is to add links to the category, you want to usethe keyword you want to replace as the name, and the description is what will show up in the tooltip. Another example;
The only option that matters here is “visible” if you select no, the link will not be entered into the loop for replacement.
Next, open up the plugin found at /wp-content/plugins/wp-text-link-ads.php and set the $category variable to the category in your links list that contains the keywords you want to replace. For example, if your category is 9 you would change $category = '3' to $category = '9'. Instructions on this are in the plugin.
How does it work?
The plugin will look for every instance of the defined keyword and replace with it with a text ad link containing a popup tooltip, these tooltips are stored in the footer and are called when the link is hovered over. If a user does not have javascript active, the link is displayed as normal. If you are looking for affiliate programs to try out and use keywords for, I recommend LinkShare, or Commission Junction.