Netflix should have mood lists

I have about 500 titles in my Netflix queue, and my movie- and TV-watching moods shift regularly, so I often find myself searching through my entire list for something I'm in the mood for, digging up info on titles I've already researched, and generally wasting time. It would be nice if Netflix allowed its users to privately tag and categorize titles. I might tag The Matrix as science fiction and action, or Cowboy Bebop as anime and science fiction. Then I could log into Netflix every couple of weeks, simply change my current mood, and Netflix could ship me titles from one mood list at a time.