The server itself is quite speedy, and load averages are nominal, but Movable Type is very slow this morning. New posts and page rebuilds are taking a while, and some commenters are posting twice because of the long delay. Be advised that the first submission did go through, though it may take an awfully long time to appear at the moment.
Update, 9:20 PM: It improved considerably by late afternoon.
Update, Sept. 5 at 7:10 AM: DreamHost reports load issues on the server on which the MySQL database is being hosted. They’re moving services to other servers to balance the load and straighten things out.