I managed to (again) break into a private beta. I used a simple procedure, I copied the login form from another site and used the SE.com openID login. It didn't complain at all, and I wasn't committed to the site on Area51.
Does this need to be fixed? (I realize that it's no biggie if a few people break into private betas)
The older system used to check one's openid against a list of committers. The newer system only allows logging in via a (unique for each user) link, but the original checks in the openid system seem to have been removed since the OpenID login page no longer is there. It probably would be a simple fix to add these checks to