The server is having some problems that I haven't had time to fully diagnose. I think there's a memory leak in one of the pieces of software that I upgraded recently. If you've been having problems seeing the site, or wondering why I haven't been writing much, that's part of the reason why.
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Leak
The leak is either in Apache, one of Apache's modules, in PHP4, or in one of the PHP4 modules. I've arranged for Apache to restart itself automatically every hour, which should keep the damage contained, but I still don't know exactly where the problem lies.