Discovered this last night when I upgraded my copy of Onyx (Freeware, Mac OSX only). You can change iTunes behaviour so that clicking one of the little arrows next to a song/artist/album/genre name brings you to a filtered browser list containing matches, and not the iTunes Music Store as it does by default. If this option exists in the preferences, I haven’t noticed it.
Example: Clicking an arrow next to “Ryan Adams” in a track listing will display all songs by Ryan Adams. Faster and easier than entering the browser and finding what you want when you’re already looking at it.