Coming up: My tutorial on how to leave a Typekey authenticated comment on this blog
The fact that a tutorial is needed speaks friggin' volumes. It took me all of yesterday (and about 10 unneeded rebuilds of this blog) to figure it out. Basically, if you are signed up and logged into Typekey, you shouldn't enter name, e-mail address and URL. Then the system will accept your comment as "authenticated" by Typekey. And if you appear to be logged in but the confirmation screen says you need to fill in the name and other fields, just go backward, log out and log in again, and it will work.
Needless to say, we're moving away from Typekey and toward the new Movable Type comment verification system (which is currently in use on our most popular Daily News blog, Inside USC).