It was pointed out to me that comments on my old posts were showing as raw HTML (you know, a sort of \<p>this is a comment\</p> sort of thing). I knew this. However, the reason it was like that is because it occurred to me about five minutes after releasing thort, the engine that now runs this place, that comment HTML was just displayed. Unsanitised.
Cross-site scripting, anyone? Oops.