The new comments policy I instituted a while back has been working very well so far (knock wood) to block trolls.

On the other hand, it’s a trifle overeager and sometimes blocks certain comments from regular comments for no reason whatsoever, as far as I can tell. So if you find that a comment of yours fails to appear, please wait a few hours. I check these things at least once a day, and I’ll liberate it from the moderation or spam pile before too much time passes.

Also, comments from first-time commenters go into moderation just that first time, until I approve them. After that, comments from that same commenter should appear automatically.