The Window menu contains the following items:

Info Window
Opens a window with statistics on the currently playing item.

Cover Art Viewer
This floating window will display any cover art contained in an MP3 while that item is selected in a playlist window.

Stream Guide Window
Opens or closes the handy stream guide directory, allowing you to easily find streaming audio stations.

Visualizer Window
Your window to another world... will display the current chosen visual plug-in, as specified in the Console.

Full Screen
Switches the visuals into full-screen mode.