Using Link Arrows to the iTunes Store in iTunes 4.5
In iTunes 4.5, arrows appear next to song, artist, and album names in your library and playlists.
You can click these arrows to find related music on the iTunes Store.
If you'd rather browse that item in your library, there's a shortcut for that, too. For Mac users, Option-click its arrow, and for Windows users Shift-click it.
