It seems that yesterday was the day that my co-hosting provider was moving all of my Squishr boxes from one location to another, and our app got bonked. Of course, it's also the day a bunch of traffic comes in from a TechCrunch comment and then gets routed to an old landing page for the app that hasn't been up for months.
Oh well, things are back up now. The lesson here is to make sure that your machine comes back up in the correct state after being rebooted. Live and learn, I suppose.