I have always loved the Catfish ad script that Alex Walker of SitePoint developed. I finally got it working on a site that is not WordPress driven, but which will be soon. I used the script copy from Matt Oakes in the UK.
I decided to ask Matt to help me develop a plugin for WordPress that would allow easy carefree installation of a Catfish Ad.
What we have here is a free, beta version of the resulting plugin. I have personally tested it on a number of my own WordPress sites. Please let me know if you have any issues with it and I will try and help resolve them.
You can check out a demo at my personal blog.
Download (Version 1.0 Release Date March 28th 2009)
I am now using the WordPress Plugin Repository for managing the versions of this plugin.