286141 Drag and Drop eCommerce Store

I need a drag and drop ecommerce solution similar to [login to view URL] I would prefer it coded in ASP.Net with Ajax but I'm open to options. The main framework we use is DotNetNuke (DNN). If the solution can be integrated with DNN that would be huge! As part of this solution we need an intuitive front-end admin interface for maintaining products and the ability for customers to pay via Paypal and Authorize.net. We also need an intuitive way for users to remove products from their cart after going to checkout. We love the way 37Signals different interfaces (Basecamp, Highrise) work and would like the overall ecommerce experience to be similar.