Bigger question, why don't all OpenID sites have vCard output on the user's ID?
Only Linkedin has vCard done right at the moment, and they aren't yet OpenID aware.
For OpenID there should be a standard URL method for acquiring a vCard on anyone. The ID for authentication is just one piece of the pie, we need the ability to exchange ID information to external services.
Syndicate people, syndicate.
Update: And Mark did find one site that is doing that, http://videntity.org/ which is pretty cool, but this is just one site. We need all sites to do this.