I think it would be more colorful if you show the listings in thumbnail view rather than a plain list view. The long list of items that show up when I click on a category is not very pleasing to the eye. The thumbnail currently shows up when I click on
a product, but it would be good if it appears in the list as well. Also if you can embed the thumbnail in a nice glass box that blends well with the background, that will be very cool.
Several scenarios that I thought were possible through WinFS can be done using this edition. Well, I cannot use data of other applications but persistence and query processor by themselves give lot of power to an application and cuts down lot of custom code.
Above all it is free.