Hrm... I still seem to be having problems with comments on this site. We recently upgraded to MoveableType 4, and comments were turned on again with the upgrade. Before that the spambots were taking down the server with all the comment spam. So E turned it off.
If you click on an individual entry you can make a comment that way. But I just realized that clicking on the comments link from the main page throws an error. Sorry about that folks. I'll see if E can fix that this weekend.
Though that would explain why I haven't gotten that much spam on this site since the comments were technically turned back on.