I've been getting reports from people that they're getting a mangled response page after posting/attempting to post comments (not that there are a lot of them to begin with).
I'm not entirely sure what's going on but given the age of the blog, it's possible there's something messed up in the database.
I've had on my TODO list for a while now to restart the blog using a fresh MT5 install, fresh DB and republishing what's in the current blog into an archive folder.
What's that you say? Just use Wordpress?
Maybe I'll take this opportunity to do drink more of the Drupal Kool-Aid.
In the meantime, feel free to leave a comment on my Facebook page (blog posts get crosposted there) or Google+ page, send me a tweet, or just email me.