Many readers (and myself) are experiencing a problem with the new commenting set-up. You click the "This weblog only allows comments from registered users. To comment, please Sign In." part and either nothing happens or it lets you log in to TypeKey but then nothing happens. It was working for me last night but not today. Strangely, I have gotten a few comments on one posts but none on the others.
We have logged a ticket with our site provider, TypePad, and hope they get back to us with an answer or a solution soon. Try checking back tomorrow. Sorry about this.