Strategies for Categorizing Categories
http://www.uie.com/articles/strategies_categories/

User Interface Engineering
2002

Abstract:

How does a site containing thousands of pages of content get users to the content they seek quickly?  There are many different strategies for organizing content on sites and we recently took a hard look at five of them. We've been examining several e-commerce sites to see how they handled the problem of categorizing large numbers of products. We were interested in seeing if the different designers came up with different methods and which methods were most effective.