Now I have experienced being taken off the net by a comment spammer. Some lame ass trying to advertise his prono-site attacked my server with comments. Handeling MySQL inserts, page rebuilds etc. just got to much when MT was told to do it several times a second. Luckely I discovered it in time to shut down the webserver, block the offending IP, and then restart.
Now I am curious to see if the ISP of the offender will take action against him/her/it.