Sometimes an idea occurs simply because it's time for it to occur. It occurs to multiple people in multiple places at, roughly, the same time. Often those ideas, brilliant though they may be in their own right, are simply the extension of the ideas of others - a synthesis of many thoughts to arrive at a new conclusion. That appears to be happening in identity right now. The last two issues have talked about the grand unified theory of so-called "enterprise-centric" and "user-centric" identity. Now comes a paper talking about the interoperability of the two major user-centric models: information cards and OpenID.