The easiest way to replace specific keywords with an affiliate URL across your Wordpress site.

The Wordpress Campaign Manager plugin gives you absolute, site-wide control over your affiliate campaigns. It has two main features:

1) Replace any word on your entire blog with an incentivised link For example, you can replace any instance of the word "hosting" with a link to a hosting affiliate scheme - across every single post, all managable from this single plugin

2) Mask your affiliate URL's with friendly ones This plugin can turn http://www.this-is-a-long-affiliate-url.com?referal=you123456 into a more friendly, inviting http://www.your-site.com/go.php?l=scheme