2. Facetmap is distinguished by its facet models. Notice that when you select a heading from a list, that list is replaced by a list of subheadings of the heading you just picked. This lets you get more specific if you want to -- just as when you browse a traditional hierarchy like Yahoo.
But you also get the benefit of letting users drill down into your resources using whatever criteria are most important to them -- the price-conscious user and the user with a picky palate are both served by the same system, as is the user who cares about both qualities.