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As a quick fix, just grab the source from the Google cache and throw up a static HTML file.

Ah. That's a good idea which I totally failed to follow.

Instead I flailed around blindly in the usual manner of trying to get PHP applications to work and seem to have fixed the problem. :-)

I should really move my blog to an environment I actually understand and have control over.

WP Super Cache is definitely your friend if you must self-host.

Yes, I know. I had it but my config was badly broken so it wasn't doing anything. Whoops.