Note: this post is a work in progress.
As an exercise for my book, Enterprise Ruby on Rails, I will be creating a workflow based implementation of the iBatis Petstore application. It will use OpenWFE4ru (aka Rufus) and Globalize, and be fully unit and integration tested. It will contain no added GUI sweeteners, as it is meant to display best practices; convoluted AJAX code will just get in the way of that. I may base it on an older version of Rails Petstore (before it got mixed up with AJAX), or start from scratch--further evaluation is necessary.
Aside from those key points, it will be a typical Petstore application. I've created the designs and begun exploring necessary tools, however I have an exam to prepare for next week. But I'll find time soon.