amazon chocolate left nav, another deeper hierarchies example

Amazon has an example of a different way of giving quick access to deeper sub-categories. Instead of having a Milk/Dark/Other navigator a user would have to get through first in order to see deeper subcategories, they broke them out into separate search facets in one navbar.

deeper hierarchies

Example of category + subcategory hierarchies combined together in one facet navigator.

found on Agilent (also powered by Endeca)