[PidGin128]

This is an interesting idea.

Perhaps an intermediate site, that you log into with an OpenID, and which then gives you a new OpenID that has some form of ranking/karma system enabled?

Or- Just a standardized method to track karma/ranking across disparate sites? Maybe an extension to OpenID, feedback for feedback?

The only obstacle I see, is how the information would be conveyed. Without the participation of the hosting site, it would be little more than a static link.

Maybe a tangent of Flattr's offerings?