I don't usually mention technical details about this site here but, um, comments are back up.
(I was being spam flooded the other day and quickly renamed the comment script... and promptly forgot to name it back...)
Permanently naming the comments script something original is a good idea to get rid of some automated spammers (who may be searching for the standard comments filename to start with).
Just set the new filename in mt.cfg using the CommentScript variable and rebuild, and you're all set. :)
I'm on Typepad so I don't have that kind of control. I got hit with 200 comment spams this weekend! Fortunately, they're very easy to find and delete (in bulk).