ETA: I just contacted the site administrator, who unfortunately is not physically located near the server. He's not sure why the server went down but someone is supposed to go check on it later today. Hopefully it'll be back up by the end of the day, but depending on the magnitude of the problem, may go up tomorrow. Once again, I'm really sorry for the inconvenience.
Edited again 10/20 to add: Yay! The site is back up! Sorry again!