After playing around with prism, I wanted to do the flexstore application using silverlight and prism and submit for the Component Art competition, but it looks like I am not going to much more than what I have till now after all, but it was a good learning exercise. Here are some screenshots of the app. you can try the demo here.
Note: All the functionality is in the products section. Drag and drop is not functional. we have to click on the buttons that popup when we mouse over the items
you need to login before you can submit an order. Data comes form an xml file. Users, and their orders are stored in the IsolatedStorage
The code is not optimized nor is completely organized, but if you want to take a look at it, here is the link