*faintly exasperated* I am making this suggestion in the context of the foregoing discussions of changing how the OpenID fields are presented. They can fill in their username. What I am suggesting is merely a small time-saving aid by letting the service field autopopulate. If this is going to feature anything like a dropdown of common OpenID enabled services then the form itself will have to have separate fields for service and username, which will be combined in the backend before sending.

I think that will save a whole lot of confusion among those who are unfamiliar with OpenID, too.