Open iTunes Store In a New Window

While it seems like iTunes is a one-window application, you can in fact have multiple windows open. For instance, if you want to have your music library in one window and the iTunes Store in another, just Control+Click or Right+Click on iTunes Store in the left sidebar and choose Open in New Window. You can do this for most things in the left sidebar. New windows will be lacking this left sidebar as it only remains in your primary iTunes window.