John,
In the Standard View of the Windows version, you can set the track info skin by right clicking in this space while a track is playing. Then a menu is displayed that lists the track info skins that are installed. These are located in a directory called "Visualizations/Track Info". The Track Info skins consist of the htlml and css files that control what info is displayed in this space.
In the Mac version, this directory doesn't exist and there is no capability to right click in the track info area to get to this menu. Would be great if this functionality could be added like the Windows version. If you don't want to add, I would settle for being able to manually edit the files if I knew where they were. Currently the Mac version just displays the cover art but I would like to be able to skin this area.
Hope that makes sense.