Update: Before you get too bummed about myopenid.com in this article, take a look at Larry's comments from JanRain below. Every now and again, you'll find a company that goes out of their way for true customer support. MyOpenId.com appears to be one of those companies.
An OpenID provider must always be up and accessible. For the sake of its users, for the sake of their company, for the sake of the internet.