So thanks to Jess I discovered a little quirk here since I upgraded to MT4. If you previously commented using Typekey then you may have had a problem trying to register here now (Movable Type now has built in registration so you don’t have to use typekey if you don’t want to). I’ve cleared out the database entries so if anyone previously tried to register but received “a user with that name already exists” then you should be able to register now if you so choose. Otherwise typekey still works as do LiveJournal logins, OpenID and Vox logins.
Let me know of any wonkiness you encounter.