How did I get over fifty categories? I'm cleaning these up, mainly by consolidating those which were always too specific. There will be a single "Universalism" and "Unitarian Universalist Association" category. Cleaning up means adding some posts to more recently added categories: "religious architecture" is a beneficiary here.
But why categorize? Because, among other reasons, Technorati picks up the categories as tags. (An example) Categories also give readers a way to browse through thematically similar posts. And you can -- if saavy -- get category specific news feeds; this is how I "transmit" articles I want posted to The Daily Scribe, since some are too trivial too be interesting there.