My server has apparently gone blooey sometime within the last half hour or so: at the moment, none of my web sites is currently reachable. I’ve contacted DreamHost about it; let’s see how long they take to fix it.
Update, 9:13 PM: Everything just came back online. The server had some NFS issues, and then didn’t want to reboot, but the technician power-cycled it and now everything appears to be back to normal. Total downtime was a bit more than an hour.