iNeedFlix is a no-fuss manager for your Netflix queues. Instead of opening up your browser and going to the Netflix homepage every time, you can install iNeedFlix and do it all from your desktop. Elements can be dragged and dropped from your queue and moved around.
Although the application doesn't have a preferences menu and only shows the movie screenshot and synopsis, it manages to capture the essential elements. If it was supported on other browsers than just Safari, iNeedFlix would probably be more useful, but the fact that it connects to the Netflix server is a huge plus.
A good solution to quickly browse through your DVD rentals, without ever visiting the Netflix homepage.