I really like the idea of open id. In almost all scenarios open id wins. There is one problem though. Availability of the open id server that authenticates you is important. What happens if the server is busy or down?
Even if the site you are trying to log on, also provides the traditional means of username/password authentication, I am sure most of you will not remember those. You have to ask for an email with your password and wait and then log in.
As I write this post http://www.myopenid.com doesn’t respond and I cannot log on to a certain site that is part of my daily work.
Just a quick note to say that open id is not all roses.