Playing Now Popup
The Playing Now Popup introduced in MC 33 automatically displays track information when the currently playing track changes. Pressing Ctrl+i on the keyboard will display the popup manually. The amount of time it shows for and other display properties can be edited in the settings accessed through Tools > Options > General > Interface > Playing Now Popup or by clicking on the popup and selecting Settings from the menu. The content and layout is defined by a skin file and there are some built-in skins to choose from (selected in the popup settings). You can also create a custom skin.
Custom Skin Creation
To make a new custom skin, create a new folder under "[MC_PROGRAM_FOLDER]\Skins\Playing Now Popup". For example, create "C:\Program Files\J River\Media Center 33\Skins\Playing Now Popup\My New Skin". A file named main.xml is required in the new folder to define the content so either create one or copy the one from one of the built-in skins.