While it was a trickle at first, comment spam ramped up to 100+ per day in the past couple of weeks, so I bit the bullet and learned how to install WordPress plugins. That may not sound like such a big deal, but I don't know PHP and have absolutely no desire to learn. In fact, I have so little desire to learn PHP that I thought briefly about switching to NewsBruiser (which is written in Python, a language I know, and offers a bayesian filter for comments) or even Movable Type (which is written in Perl, a language I used to know), but in the end, suffering a little PHP was more palatable than the thought of migrating content, proxying permalinks, and learning yet another weblog server.
All in all, it turns out to be trivial — there is a WordPress "CAPTCHA" plugin called "authimage" that does the job. Even though I had to make some simple changes, installing it took all of 20 minutes, including installing a couple of necessary debian packages -- and I still don't know PHP.
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