The Sliced Menu allows menus to be sliced into a block per level. It behave like primary link with no level limitation.
If a menu with four levels (depth) is sliced, four blocks will be available in the administer block section. Each block will contain a level of the chosen menu. If a menu item is selected, the next level is visible. If item doesn't have sub items, the block won't be displayed.
This module can be used to make navigation more themable. For example, you can put level zero on top of your site, level one on the left sidebar, level two on a navigation table on top of a node and every other level wherever you want.