I just sent my feedback to iTunes for a new feature I truly need, anyone else like it?

I make a lot of playlists; playlists that have a certain mood, playlists for my girlfriend, etc etc. I often lose track, however, in what playlists I have put a certain song. One song might find itself in two or three different playlists, and sometimes a song I want in a playlist isnt in there. To make a long story short, when you are browsing the library, you have NO CLUE as to what playlists those songs find themselves in. If there was a feature that made it so when you highlight a song in the library, the playlists that contain that song also become highlighted, Id be a happy man. This way, if you have a brazillian song and you dont know whether or not you put away in your renown and quite large "Brasilia" mix, iTunes will tell you right away. This tighter integration of library and playlists would be help people organize their music. If you dont intend on supporting multiple genres, the least you could give us is this. Hope this helps...