See this demo of a faceted browser for situations where a collapsible tree or breadcrumb trail don’t quite fit the data. To see what’s going on, click on links under “Browse Varietal”, “Browse Region” or “Browse Price” two or three times and watch the results list at the bottom right of the screen become shorter and more specific. Then go back to the top right and look at the section under “You’ve selected these headings:” and try backing out to more general criteria.