The difference from ScrolledListBox is that instead of just strings, you can use arbitrary sets of widgets as list items.
Only requirement is that the list items be subclassed from WidgetListItem (which is itself a subclass of Tkinter Frame).
(You can even have different types of items on the one WidgetList).
List items' styles can be easily set.
Normal keyboard/mouse interactions apply - click, mousewheel, up, down, pageup, pagedown, tab - and appropriate scrolling happens automatically.
Demo code included with module. Run epydoc on the module to get nice doco.