An OpenSocial reality check from Marc Canter; see the full article for details
Turns out that Google's altruistic motives were supplemented by a desire to occlude Facebook's ad announcements. OpenSocial got announced too soon, and many of the technical details and logistics (issues like security) had yet been worked out. And worst of all, many--if not all--of the OpenSocial participants did not intend to open up their networks at all. They simply wished to bring in as many OpenSocial "gadgets" as possible in an attempt to counterstrike Facebook's successful platform of applications.
For all its promises, OpenSocial really only appears to be "OpenGadgets."