It seems like commenting hasn’t been working for a while - I have no idea why, I had tested it after setting up my new Movable Type version (and until recently, comments actually showed up). I just fiddled with TypeKey again, and it does seem to work (again). If you run into any trouble commenting (you’ll know when there’s a problem: TypeKey will claim commenting hasn’t been set up correctly), please email me!
Update: It does seem to work now, there were a couple of comments coming in. In the future, if you can’t comment (and the system complains about something) please send an email!