The Nike Store provides an excellent faceted navigation for narrowing product listings by sensible facets including gender, product type, sport, color, and price. The site skins the faceted classification tool provided by Endeca, which allows the user to select a product attribute of interest under any facet, and continually provides feedback about the attributes in other facets that can be used to narrow your choice of products down. Nike's Flash-based implementation is appropriate and useful, and ranks among the best examples of faceted navigation you will find on either commercial or academic databases.