Currently, the best performance with Iowa is attained by using it in
conjunction with the mod_ruby handler, named mod_iowa.rb, for handling the
communications between the web server and the Iowa application process.

http://enigo.com/projects/iowa/tutorial/getting_started.html has more
specific information on how to use this handler.  If you use Iowa in this way,
I would appreaciate any feedback you might have at khaines@enigo.com.