For those of you who are extra curious, and for those who weren't even here, the forums were down the last eight or nine hours because of low disk space on the partition that contains the server's log files. The forums were handling the load fine, but the logs themselves ran out of space, which makes things that log (like the webserver) stop working. I contacted Jonas22 last night and he got everything sorted out first thing this morning, so no harm done.
Make sure to thank Jonas for being awesome and working hard for us even though he is basically never on the forums.