I feel that anyone who has a part in a site should get some credit. I use Joomla as the framework for most of my sites. It is powerful and is customizable. Only other webmasters would have a clue what it is. So until a get a credits page up for any opensource scripts it is only honorable to keep some sort of link to them. How were the search results on the engine?
PS. I think that you would understand since you use wordpress. I am sure that you are involved in the wordpress community.

__________________
Get listed and Promote at http://yoddle.net