Seems like the site has been switching back and forth between MT and WP because I didn’t really delete my MT installation, thinking I’d keep it there so that I can revert to it in case of any problems that I might encounter. Problem is, as a lot of people probably get to my site through Google and such (and because of some browsers’ cache), they were getting to the old site, and when they posted comments, it would create the index page again, but in MT. I’ve deleted the old site now, so if you happen to try posting now and it gives you an error message, just refresh your page. Sorry for the inconvenience.
Update: I’ve also cleaned things up, and for the first time this page validates for XHTML 1.0 Transitional. The geek in me is getting a kick out of this.