So despite my best efforts I got no clue how to fix this, and finally, I'm like' hurr-durr I'll ask the people on the server if this ever happens to them and how to fix it. So any help woould be appreciated.
The server went down at 2012-04-09 04:12:35 local time and restarted itself 2012-04-09 10:09:15. The reason was a severe error in either Spout or Bukkit. Will look into the problem.