John Udell:

"There's a lot of advanced research and literature on the subject of taxonomies and topic maps. To be honest, much of it goes way over my head. I'm keenly interested in the problem of categorizing content, but the more I wrestle with the problem, the more it looks like a job for a bit of scripting and common sense. A few times recently, I've gone through the exercise of mapping a set of dozens or hundreds of URLs to a set of topics. What seemed like a daunting task has turned out, rather surprisingly, to be not so hard."