I've triple-checked everything in the installation of MT-Keystrokes. No idea what's wrong, but comments are still coming in faster than I can delete them. (And no, I didn't forget to rebuild the site after modifying the templates to call the script.) The only thing I can think of is that I've missed a form somewhere on one of the templates. I've looked and looked, but I can't find anything. So, unfortunately, it's time to give up on MT-Keystrokes. I'm going to try MT-Moderate out for a while.