RSS Spam Problem Fixed

I found the immediate cause of the Google Reader spam problem, thanks to this thread.  It turns out that someone was able to get a hacked entry into the database (specifically, into the wp_options table).  The important parts of the entry look like this: ;))”==QfK0wOpcyMyEzbo [... lots more gibberish-looking stuff, which is actually base64_encode()'d stuff] [...]