Amazon is refusing to sign. Google is refusing to sign. Microsoft is refusing to sign.  It's a smart business move.  IBM is proposing what is essentially a "stop Amazon" Open Cloud Manifesto.  IBM is attempting the old business model of the old guards setting interoperability standards.  Do we really need more useless WS-* standards?  Or are we better off with standards growing organically (Amazon is becoming a de-facto standard).   Sun, for instance, recently announced that they were making their cloud APIs compatible with those from Amazon.  And yes, that is one way to drive up your buyout price.