>>7
What stops that someone else entering the address is that the address they enter will be pointing to your OpenID service, which will have given your browser a token, not theirs.

On a blog which allows non-OpenID comments, someone could enter your address without penalty, which is why in the future, we should start enforcing some form of identity checking on blogs which require it.

That being said, OpenID is not ideal as it requires the commenting party to have a web site. I know a lot of people who have an email address and no web site, or have an email address and a Jabber ID, and so forth. Passel would solve a lot of that kind of issue since it allows virtually unlimited methods of identification.