Filippa Smedhagen Sund has a portfolio site that is a must see. The unique user interface is controlled by the user clicking and dragging to move from one photo to the next. The part that I found most interesting is that you can scroll up and down as well. Where side to side moves between photos in collection, up and down moves between collections. To me as a designer, one of the signs of a superior website is that I don't stop and think about how it's done. I don't identify it as a Flash site, or think about the CSS structure.