Screenshots from the UI mockups for the mall and store managers, and mall and store creation wizards can be found here. The actual demos are located on exciton at /jsegars/Milestone 2/.
Usability TestingDescriptions and results of the testing we performed on the mall manager have been posted by Kijana here but if want to actually watch video of the users, it is available from excition. (Just a note: To get any value out of the video, its probably helpful to read through the task list that we gave the users and to play with the user interfaces a little bit so you'll have an idea of what the users are actuaully doing)