In later versions of iTunes, little arrows appear next to songs when they’re highlighted. Normally, when you click on these arrows, you’re directed to the iTunes store where you can browse related albums and songs. I recently discovered that these arrows can actually help you browse your own iTunes library. Simply hold down the Option key while clicking the arrow next to a song, and iTunes will show the albums with that song. Option-click next to a performer’s name, and iTunes will show all songs by that artist.
By using the Option key, the iTunes arrows are actually somewhat useful!