I only have the one that I used to sign up for StackOverflow. Thus far nothing else has required it. Or rather, nothing else that requires it has been so comp

I only have the one that I used to sign up for StackOverflow. Thus far nothing else has required it. Or rather, nothing else that requires it has been so compelling in other ways that I'm willing to put up with OpenID in order to use them. Now that Gmail is a provider, the barrier is lower, but back then you had your pick of a half-dozen fly by night early adopter providers. So anybody who used it back then has at least one worthless OpenID.