Google Optimizer might help you. They have beta testing set up to view a step-bystep demonstration of how to successfully launch multivariate and A/B split experiments. Not sure if that will help your situation, but thought I'd throw out this option. Thanks Pam
I would use a PHP script. Keep the content of each page in the database, and then have the script randomly choose which content to display.
could be as easy as making each page seperate. then use a switch statement to iframe the page you want. That's the cheep, lazy, non database way. Or do a switch statement on a header("Location: site.html"); kind of thing