“It used to be that Web sites offered one or two things. Now it’s common to find sites with thousands or millions of items. Wonderful, but that means that item listings are often very long and hard to use.
One of the main usability guidelines for category pages is to let users winnow items according to attributes of interest. To “winnow” a list basically means to filter out elements that don’t meet specified criteria, leaving a shorter list that’s easier to manage and understand. ”
Sounds like a job for faceted classification! Dooo do do!