In honor of the new year, I am declaring a fresh start. There will be no comment accounts required. Guests, strangers and merely the strange may post.
This policy will be in effect unless there are further problems — either trolls or spam or both.
To those of you who registered, thank you. If there are more problems, you will be able to continue posting with no problem because you have already registered.
UPDATE: Chris says registration has other benefits, such as "guaranteeing that people can't post with your name." So you may want to consider registering anyway.