Hi,
For those of you who are in to multivariate testing, you might be interested in the release of Google Adwords Website Optimizer (though it doesn't seem to handle Taguchi tests unfortunately ... which is a huge shame)
You can find out more here:
http://services.google.com/websiteoptimizer/index.html
Take a look and sign up if you think it will help optimise your site.
Cheers