I just realized that the server often returns a 500 Internal Server Error when one tries to post a comment.  I apologize to anyone who has experienced this problem; I know how discouraging it can be to type out a comment only to find that the website is malfunctioning. 

Comments do seem to post successfully despite the error, but aesthetically receiving an error upon posting a comment is far from ideal.  Receiving these errors seems to be a general problem with Movable Type 4.0 and above.  Rest assured that we're working on it, and in the meantime, don't be afraid to comment and please excuse our errors!