I guess I need a cup of coffee...I have always used the Alphabetical view, and never even noticed the Categorical sort there right in front of my nose. That said, after poring over the Categorical view for a bit, it seemed a bit confusing to me, since you would need to know which category to look in to find the forum you're looking for. But as I said, I've been using the Alphabetical view forever, so it's burned into my synapses.
Joe Bourke
Owner/Creative Director
Bourke Media
http://www.bourkemedia.com