https://www.metallica.com/registration_form.asp

This is a project that was turned over to me from another developer to redo. I converted the form from a very very complex system of building inputs from xml config strings saved in a database to HTML with some supporting logic on page load. The result was a tremendous speed boost, flexibility in custom upgrade requests, and resolution to many bugs in the original code.

The registration form includes the following features: configurable product sections, ajax coupon validation, and international/USA layouts with validation customized for each.