The application provides a good service, does what it says, is easy as pie to set up, has a nice, clean interface, and -- to be much appreciated -- is free. It's an ideal 1.0.
In my opinion, some additional features would make it even more useful and convenient: sticking it in the menubar; maybe a "keep on top of other apps" with an opacity control; making different orderings one-click possible, like by alphabet, %change, and a savable favorite order. Many people might appreciate additional info columns, whether from the client-side (shares purchased etc., net value) or the market-side (shares exchanged etc.).