Comments have not only been disabled, but the comment-specific php files have been renamed. su.tnemnethgilneneddusnull@oliL has hammered this site with over 200 comments in the span of five minutes. Anyone who wants to reach me can do so by using the Contact link instead. Make sure you reference the entry you are commenting about. Don’t make me guess!
More on the culprit: Looking through my server logs, it appears these are the IP addresses to ban (I went through CPanel and banned these from the entire site, not just WordPress).